31 results on '"SCINTILLATORS"'
Search Results
2. Single Crystalline Films of Ce3+-Doped Y3MgxSiyAl5−x−yO12 Garnets: Crystallization, Optical, and Photocurrent Properties
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Vitaliy Gorbenko, Tetiana Zorenko, Anna Shakhno, Paweł Popielarski, Andres Osvet, Miroslaw Batentschuk, Alexander Fedorov, Sebastian Mahlik, Tadeusz Leśniewski, Natalia Majewska, and Yuriy Zorenko
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Ce3+-doped ,liquid-phase epitaxy ,phosphor converters ,single crystalline films ,luminescence ,General Materials Science ,scintillators ,photocurrent ,ddc:600 ,Mg2+–Si4+-based garnet - Abstract
This research focuses on LPE growth, and the examination of the optical and photovoltaic properties of single crystalline film (SCF) phosphors based on Ce3+-doped Y3MgxSiyAl5−x−yO12 garnets with Mg and Si contents in x = 0–0.345 and y = 0–0.31 ranges. The absorbance, luminescence, scintillation, and photocurrent properties of Y3MgxSiyAl5−x−yO12:Ce SCFs were examined in comparison with Y3Al5O12:Ce (YAG:Ce) counterpart. Especially prepared YAG:Ce SCFs with a low (x, y < 0.1) concentration of Mg2+ and Mg2+–Si4+ codopants also showed a photocurrent that increased with rising Mg2+ and Si4+ concentrations. Mg2+ excess was systematically present in as-grown Y3MgxSiyAl5−x−yO12:Ce SCFs. The as-grown SCFs of these garnets under the excitation of α–particles had a low light yield (LY) and a fast scintillation response with a decay time in the ns range due to producing the Ce4+ ions as compensators for the Mg2+ excess. The Ce4+ dopant recharged to the Ce3+ state after SCF annealing at T > 1000 °C in a reducing atmosphere (95%N2 + 5%H2). Annealed SCF samples exhibited an LY of around 42% and similar scintillation decay kinetics to those of the YAG:Ce SCF counterpart. The photoluminescence studies of Y3MgxSiyAl5−x−yO12:Ce SCFs provide evidence for Ce3+ multicenter formation and the presence of an energy transfer between various Ce3+ multicenters. The Ce3+ multicenters possessed variable crystal field strengths in the nonequivalent dodecahedral sites of the garnet host due to the substitution of the octahedral positions by Mg2+ and the tetrahedral positions by Si4+. In comparison with YAG:Ce SCF, the Ce3+ luminescence spectra of Y3MgxSiyAl5−x−yO12:Ce SCFs greatly expanded in the red region. Using these beneficial trends of changes in the optical and photocurrent properties of Y3MgxSiyAl5−x−yO12:Ce garnets as a result of Mg2+ and Si4+ alloying, a new generation of SCF converters for white LEDs, photovoltaics, and scintillators could be developed.
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- 2023
3. Perovskite nanocrystal doped all-inorganic glass for X-ray scintillators
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Xianghua Zhang, Mengling Xia, Xudong Zhao, Yinsheng Xu, Wuhan University of Science and Technology, Huazhong University of Science and Technology [Wuhan] (HUST), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), National Natural Science Foundation of China (NSFC) [61905082, 61975156], Hubei Natural Science Foundation Natural Science Foundation of Hubei Province [2020CFB641], China Postdoctoral Science Foundation China Postdoctoral Science Foundation [2018M642827], Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
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Materials science ,Glass fiber ,luminescent glass ,02 engineering and technology ,scintillators ,Scintillator ,010402 general chemistry ,01 natural sciences ,Particle detector ,CsPbBr3 nanocrystals ,radioluminescence ,Materials Chemistry ,[CHIM]Chemical Sciences ,Perovskite (structure) ,business.industry ,High-refractive-index polymer ,Doping ,General Chemistry ,stability ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Nanocrystal ,Optoelectronics ,0210 nano-technology ,business ,Luminescence - Abstract
International audience; Radiation detectors require scintillator materials combining high light yield, short light decay time and high stability. Metal halide perovskite nanocrystals (PNC) with heavy atoms have demonstrated excellent luminescent efficiency and short emission lifetime, which perfectly match the requirements of X-ray scintillators. However, the poor stability of PNC restricts its applications. Here we report stable CsPbBr3 NCs generated in an all-inorganic glass matrix by controlled crystallization. The transparent composite materials demonstrated good luminescence centered at similar to 520 nm as well as excellent stability towards water and heat (250 degrees C in the air) due to the protection role of inorganic glass. The high refractive index of the inorganic glass matrix enhanced the radiative transition rates. With all these features, the PNC glass-ceramic demonstrated good X-ray response and fast decay. The emission intensity of PNC glass-ceramic was half that of the commercial scintillating material Bi4Ge3O12 (BGO) under X-ray irradiation (50 kV) and the decay time (15.2 ns) was one twentieth that of BGO. The excellent performance and the high stability as well as the easily processable nature of glass samples make these composite materials promising candidates for various X-ray detection scenarios such as remote X-ray detection using scintillating glass fibers.
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- 2021
4. Radiation effects on luminescent and structural properties of YPO4: Pr3+ nanophosphors
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Tamara V. Gavrilović, Ivica Vujčić, Milica Sekulić, Vesna Đorđević, Slobodan Mašić, Bojana Milićević, and Miroslav D. Dramićanin
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Nuclear and High Energy Physics ,Radiation ,Materials science ,Doping ,Phosphor ,scintillators ,02 engineering and technology ,Scintillator ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,Ion ,radiation ,luminescence ,phosphors ,General Materials Science ,Pr3+ ,0210 nano-technology ,Luminescence ,YPO4 - Abstract
YPO4 phosphors doped with trivalent ion Pr3+ were prepared by sol–gel method and treated with different doses of gamma radiation, from 0.25 MGy to 4 MGy. Effects of radiation on morphology, structure and luminescent properties were analyzed. Also, the influence of radiation on the change in the color of the samples was examined. The color efficiency of powders was evaluated by colorimetric analysis (CIE and L * a * b system). It has been observed that powders change color under the influence of radiation, i.e. they pass from white to pinkish red. Also, it has been determined that the radiation affects morphology change, as the particle size increases with increasing of the radiation dose. With the increase in the radiation dose, the emission intensity of samples decreases. The structure remains almost unchanged after irradiation, and the intensity constantly decreases with increasing of dose. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.
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- 2018
5. Luminescence Efficiency of Cadmium Tungstate (CdWO4) Single Crystal for Medical Imaging Applications
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N. Martini, George Fountos, George Saatsakis, Nektarios Kalyvas, George Panayiotakis, V. Koukou, Ioannis Valais, Athanasios Bakas, Ioannis Kandarakis, and Christos Michail
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Amorphous silicon ,Materials science ,General Chemical Engineering ,02 engineering and technology ,scintillators ,Scintillator ,01 natural sciences ,law.invention ,Inorganic Chemistry ,Crystal ,chemistry.chemical_compound ,law ,0103 physical sciences ,Cadmium tungstate ,radiation sensors ,crystals ,lcsh:QD901-999 ,General Materials Science ,010302 applied physics ,business.industry ,CdWO4 ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Photodiode ,chemistry ,Optoelectronics ,lcsh:Crystallography ,0210 nano-technology ,Luminescence ,business ,medical detectors ,Single crystal ,Visible spectrum - Abstract
Background: In this study, the light output of a cadmium tungstate (CdWO4) single crystal was measured under various X-ray radiographic energies. Methods: A CdWO4 single crystal (10 ×, 10 ×, 10 mm3) was exposed to X-rays in the 50&ndash, 130 kVp range. Measurements were evaluated against published data for single crystals of equal dimensions (CaF2:Eu and Lu3Al5O12:Ce). Since the crystal was examined for application in medical imaging detectors, the emitted optical spectrum was classified with respect to the spectral compatibility of numerous commercial optical sensors. Results: The luminescence efficiency (LE) was found to constantly increase with X-ray energy and was higher than that of CaF2:Eu for energies above 90 kVp. However, the efficiency of the previously published Lu3Al5O12:Ce was found to be constantly higher than that of CdWO4. The light emitted from CdWO4 can be optimally detected by certain charge-coupled devices (CCDs), amorphous silicon photodiodes, and photocathodes. Conclusions: The high density (7.9 g/cm3) of CdWO4 and the luminescence signal of this material make it suitable for medical imaging (such as dual energy), high-energy physics or for applications of scintillators in harsh environments.
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- 2020
6. Nanoengineered Gd3Al2Ga3O12 Scintillation Materials with Disordered Garnet Structure for Novel Detectors of Ionizing Radiation
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Valery N. Khabashesku, Devesh Kumar Agrawal, Toyli Anniyev, G. Dosovitskiy, Aleksejs Zolotarjovs, Vitaliy Mechinsky, Maxim Vasilyev, Peter Sokolov, O. A. Buzanov, Andrei Fedorov, Yauhen Tratsiak, Mikhail Korzhik, Valery Dormenev, Aleksei Dosovitskiy, Larisa Grigorjeva, and Vladimir Alenkov
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Materials science ,disordered crystal ,02 engineering and technology ,Nanoengineering ,scintillators ,Scintillator ,01 natural sciences ,Ionizing radiation ,0103 physical sciences ,NATURAL SCIENCES:Physics [Research Subject Categories] ,luminescence ,General Materials Science ,co-precipitation ,010302 applied physics ,Scintillation ,business.industry ,Detector ,multicomponent garnet ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Optoelectronics ,nanoengineering ,0210 nano-technology ,business ,Luminescence - Abstract
The authors are grateful to Baker Hughes a GE Company for support of this activity. This work has also been supported by grant N14.W03.31.0004 from the Government of the Russian Federation., The search for engineering approaches to improve the scintillation properties of Gd3Al2Ga3O12 crystals and enable their production technology is of current interest. This crystal, while doped with Ce, is considered a good multi‐purpose scintillation material for detecting gamma‐quanta and neutrons. It is observed that co‐doping with Mg affected intrinsic defects in the crystal structure that create shallow electronic traps. Other point structure defects, which are based on local variations of the crystal stoichiometry, are significantly diminished by use of a co‐precipitated raw material. Nano‐structuring of the raw material enables production of a homogeneous precursor mixture for growing a crystal with minimal evaporation of Ga from the melt. The demonstrated nano‐engineering approach increased the light yield from the crystal by approximately 20%, enabling its applications in well logging., Baker Hughes a GE Company; Government of the Russian Federation grant N14.W03.31.0004; Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART²
- Published
- 2019
7. Fabrication and Photo-Physical Characterization of Ce-doped Gd3(Ga,Al)5O12 Transparent Ceramics
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F. Cova 1, J. Hostasa 2, V. Biasini 2, M. Fasoli 1, F. Moretti 3, E. Bourret 3, A. Vedda 1, Cova, F, Hostaša, J, Biasini, V, Fasoli, M, Moretti, F, Bourret, E, and Vedda, A
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sintering ,scintillators ,ceramics ,hot isostatic pressing ,optics ,GAGG ,gallium gadolinium garnet ,luminescence ,phosphors ,particle discrimination ,ceramici trasparenti ,GGAG ,transparent ceramics ,ceramics, scintillators, phosphors, particle discrimination - Abstract
In recent years, oxide materials based on garnet structure are being investigated as very promising candidates in the field of scintillation because of their high density, good chemical stability, optical transparency, and the possibility to easily incorporate luminescent rare-earth ions. Several studies demonstrated that garnet crystals show high light yield and advantageous timing performances, which make them of interest for applications in medical imaging and high energy physics detectors [1]. Among synthetic garnets, Ce-doped gadolinium gallium aluminum garnet (GGAG:Ce) is a relatively new and interesting material. It is a mixed garnet that has displayed very good scintillation and luminescence properties: its high density enhances the interaction with ionizing radiation, and the presence of Gd provides a high cross section for thermal neutron capture [2]. GGAG:Ce preserves a crystalline cubic structure, which allows to produce it in the form of transparent polycrystalline ceramic [3] with favorable characteristics for optical applications such as lasers, LEDs, and scintillators. In this work, ceramic samples were produced by reaction sintering from commercial oxide powders: the mixed powders were pressed into pellets and sintered by a combined process of air sintering and hot isostatic pressing. The sintering process was carefully selected and the use of sintering additives was optimized to eliminate porosity, which is crucial to achieve a good optical transparency. Optical properties were studied by means of optical absorption spectroscopy, steady-state and time resolved photo- and radio- luminescence, and correlated to the fabrication process parameters. Moreover, trapping phenomena caused by the presence of point defects were investigated by wavelength resolved thermally stimulated luminescence in a wide temperature range (10 - 800 K); a significant persistent luminescence signal was also singled out and investigated as a function of temperature. The presence of point defects was also evidenced by the occurrence of a sensitization of the radio-luminescence signal as a function of increasing cumulated X-ray dose, related to a competitive process between traps and Ce recombination centers in free carrier capture. Finally, preliminary results on recently developed layered Y3Al5O12:Pr/Gd3(Ga,Al)5O12:Ce (YAG:Pr/GGAG:Ce) ceramics for particle detection and discrimination will be also reported. This work has been supported by H2020 European Institute for Innovation and Technology (EIT) SPARK project (16290) and H2020 Rise project INTELUM (644260). [1] M. T. Lucchini et al., Nucl. Instrum. Methods Phys. Res. A 816 (2016) 176-183 [2] J. Dumazert et al., Nucl. Inst. Methods Phys. Res. A 882 (2018) 53 [3] Y. Ye et al., Opt. Mater. 71 (2017) 23
- Published
- 2019
8. On the Optical Response of Tellurium Activated Zinc Selenide ZnSe:Te Single Crystal
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Dionysios Linardatos, Christos Michail, Athanasios Bakas, Anastasios C. Konstantinidis, Konstantinos Ninos, Ioannis Valais, Nektarios Kalyvas, Ioannis Kandarakis, and George Fountos
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Materials science ,General Chemical Engineering ,chemistry.chemical_element ,02 engineering and technology ,Scintillator ,01 natural sciences ,Bismuth ,Inorganic Chemistry ,Detective quantum efficiency ,chemistry.chemical_compound ,ZnSe: Te ,radiation sensors ,0103 physical sciences ,crystals ,lcsh:QD901-999 ,General Materials Science ,Zinc selenide ,010302 applied physics ,business.industry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,chemistry ,Scintillators ,Optoelectronics ,lcsh:Crystallography ,medical detectors ,0210 nano-technology ,Luminescence ,business ,Tellurium ,Single crystal ,Germanium oxide - Abstract
In this study, the light output of a zinc selenide activated with tellurium (ZnSe: Te) single crystal was measured for X-ray radiography applications. A cubic crystal (10 ×, 10 ×, 10 mm) was irradiated using X-rays with tube voltages from 50 to 130 kV. The resulting energy absorption efficiency, detective quantum efficiency, and absolute luminescence efficiency were compared to published data for equally sized GSO: Ce (gadolinium orthosilicate) and BGO (bismuth germanium oxide) crystals. The emitted light was examined to estimate the spectral compatibility with widely used optical sensors. Energy absorption efficiency and detective quantum efficiency of ZnSe: Te and BGO were found to be similar, within the X-ray energies in question. Light output of all three crystals showed a tendency to increase with increasing X-ray tube voltage, but ZnSe: Te stood at least 2 EU higher than the others. ZnSe: Te can be coupled effectively with certain complementary metal&ndash, oxide&ndash, semiconductors (CMOS), photocathodes, and charge-coupled-devices (CCD), as the effective luminescence efficiency results assert. These properties render the material suitable for various imaging applications, dual-energy arrays included.
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- 2020
9. Efficient and Reabsorption‐Free Radioluminescence in Cs 3 Cu 2 I 5 Nanocrystals with Self‐Trapped Excitons
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Linyuan Lian, Xinyuan Du, Haisheng Song, Lixiao Yin, Liang Gao, Jianbo Gao, Weizhuo Zhang, Guangda Niu, Xiuwen Zhang, Rong Chen, Xinzheng Lan, Daoli Zhang, Jianbing Zhang, Jiang Tang, Moyan Zheng, and Peng Zhang
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Photoluminescence ,Materials science ,General Chemical Engineering ,Exciton ,cesium copper halide ,General Physics and Astronomy ,Medicine (miscellaneous) ,scintillators ,02 engineering and technology ,Scintillator ,010402 general chemistry ,01 natural sciences ,Biochemistry, Genetics and Molecular Biology (miscellaneous) ,radioluminescence ,Silicon photomultiplier ,nanocrystals ,General Materials Science ,lcsh:Science ,Perovskite (structure) ,Full Paper ,business.industry ,General Engineering ,Radioluminescence ,Full Papers ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Nanocrystal ,Optoelectronics ,lcsh:Q ,0210 nano-technology ,business ,Luminescence - Abstract
Radioluminescent materials (scintillators) are widely applied in medical imaging, nondestructive testing, security inspection, nuclear and radiation industries, and scientific research. Recently, all‐inorganic lead halide perovskite nanocrystal (NC) scintillators have attracted great attention due to their facile solution processability and ultrasensitive X‐ray detection, which allows for large area and flexible X‐ray imaging. However, the light yield of these perovskite NCs is relatively low because of the strong self‐absorption that reduces the light out‐coupling efficiency. Here, NCs with self‐trapped excitons emission are demonstrated to be sensitive, reabsorption‐free scintillators. Highly luminescent and stable Cs3Cu2I5 NCs with a photoluminescence quantum yields of 73.7%, which is a new record for blue emission lead‐free perovskite or perovskite‐like NCs, is produced with the assistance of InI3. The PL peak of the Cs3Cu2I5 NCs locates at 445 nm that matches with the response peak of a silicon photomultiplier. Thus, Cs3Cu2I5 NCs are demonstrated as efficient scintillators with zero self‐absorption and extremely high light yield (≈79 279 photons per MeV). Both Cs3Cu2I5 NC colloidal solution and film exhibit strong radioluminescence under X‐ray irradiation. The potential application of Cs3Cu2I5 NCs as reabsorption‐free, low cost, large area, and flexible scintillators is demonstrated by a prototype X‐ray imaging with a high spatial resolution., Nanocrystals (NCs) with self‐trapped excitons emission are demonstrated to be sensitive, reabsorption‐free scintillators. Highly blue‐emissive and stable Cs3Cu2I5 NCs with a photoluminescence quantum yield of 73.7% are produced. These Cs3Cu2I5 NCs show a strong and reabsorption‐free radioluminescence under X‐ray irradiation with an extremely high light yield, which makes them promising scintillators for low cost, large area, and flexible X‐ray imaging.
- Published
- 2020
10. Effect of Ga content on luminescence and defects formation processes in Gd3(Ga,Al)5O12:Ce single crystals
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Aleksejs Zolotarjovs, Larisa Grigorjeva, Martin Nikl, Kei Kamada, Akira Yoshikawa, and S. Zazubovich
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Photoluminescence ,Materials science ,Luminescence ,Analytical chemistry ,02 engineering and technology ,Activation energy ,010402 general chemistry ,01 natural sciences ,Inorganic Chemistry ,Crystal ,Ce3+ ,NATURAL SCIENCES:Physics [Research Subject Categories] ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,Spectroscopy ,Multicomponent garnets ,Organic Chemistry ,Doping ,Radioluminescence ,Atmospheric temperature range ,021001 nanoscience & nanotechnology ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,Crystallography ,Absorption band ,Scintillators ,Single crystals ,Defects ,0210 nano-technology - Abstract
The work was supported by the Institutional Research Funding IUT02-26 of the Estonian Ministry of Education and Research and the project 16-15569S of the Czech Science Foundation., Luminescence characteristics of Ce3+ - doped Gd3GaxAl5-xO12 single crystals with different Ga contents (x = 1, 2, 3, 4, 5) are studied in the 9–500 K temperature range. The spectra of the afterglow, photoluminescence, radioluminescence, and thermally stimulated luminescence (TSL) of each crystal coincide. The increase of the Ga content results in the high-energy shift of the spectra while the radioluminescence intensity at 9 K remains practically constant up to x = 4. No Ce3+ emission is observed in case of x = 5. The total TSL intensity drastically increases, reaches the maximum value around x = 2–3, and then decreases due to the thermal quenching of the Ce3+ emission. The TSL glow curve maxima are gradually shifting to lower temperatures, and the dependence of the maxima positions and the corresponding trap depths on the Ga content is close to linear. However, the activation energy of the TSL peaks creation under irradiation of the crystals in the 4f – 5d1 absorption band of Ce3+ decreases drastically with the increasing Ga content (especially in the range of x = 1–2), and this dependence is found to be strongly nonlinear. Possible reasons of the nonlinearity are discussed., Estonian Ministry of Education and Research IUT02-26; Czech Science Foundation 16-15569S; Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART²
- Published
- 2018
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11. Luminescent and Scintillation Properties of CeAlO3 Crystals and Phase-Separated CeAlO3/CeAl11O18 Metamaterials
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Wojciech Gieszczyk, Pavel V. Mateychenko, Serhii Tkachenko, Oleg Sidletskiy, Iaroslav Gerasymov, Paweł Bilski, Anna N. Puzan, Yuriy Zorenko, T. Zorenko, P. Arhipov, and Georgy Trushkovsky
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Materials science ,Physics::Instrumentation and Detectors ,CeAlO3/CeAl11O18 metamaterials ,General Chemical Engineering ,Analytical chemistry ,Physics::Optics ,Cathodoluminescence ,scintillators ,02 engineering and technology ,Scintillator ,medicine.disease_cause ,01 natural sciences ,Inorganic Chemistry ,Crystal ,0103 physical sciences ,luminescence ,lcsh:QD901-999 ,medicine ,General Materials Science ,010302 applied physics ,Scintillation ,Radioluminescence ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,CeAlO3 crystals ,lcsh:Crystallography ,0210 nano-technology ,Luminescence ,Excitation ,Ultraviolet - Abstract
This work is dedicated to the growth process and investigation of luminescent and scintillation properties of CeAlO3 single crystals and CeAlO3/CeAl11O18 metamaterials under e-beam and &alpha, particles excitation. It has been shown that cathodoluminescence and radioluminescence spectra of CeAlO3 crystals contain two bands, peaking at 440 and 500 nm, and caused by the Ce3+ 5d&ndash, 4f transitions into CeAl11O18 phase, which is present in these crystals as an admixture. Under 270 nm ultraviolet (UV) light excitation, a CeAlO3 crystal possesses complicated non-exponential luminescence decay, with the average decay time of 16 ns. The light yield of CeAlO3 crystals under &alpha, particle excitation is about 16% and 12%, in respect to the standard Bi4Ge3O12 (BGO) crystal and Y3Al5O12:Ce (YAG:Ce) single crystalline film samples, respectively. The CeAlO3 scintillation decay is quite fast, with the decay time value t1/e in the 54&ndash, 56 ns range.
- Published
- 2019
12. Characterization of polysiloxane organic scintillators produced with different phenyl containing blends
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A Cemmi, F. Gramegna, Alberto Quaranta, Tommaso Marchi, M. Degerlier, S Baccaro, M. Cinausero, Sara Carturan, Baccaro, S., and Cemmi, A
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Luminescence ,Materials science ,Optical properties ,Polymers ,business.industry ,Analytical chemistry ,Scintillator ,Condensed Matter Physics ,Fluorescence spectroscopy ,Particle detector ,chemistry.chemical_compound ,chemistry ,Scintillators ,Siloxane ,Yield (chemistry) ,Optoelectronics ,General Materials Science ,Irradiation ,Polymer ,business ,Radiation resistance - Abstract
Aiming at the fabrication of elastomeric organic scintillators for the detection of ionizing particles and neutrons with good light yield, mechanical robustness and radiation resistance, several samples of polysiloxane added with suitable amounts of fluorophores, such as 2,5-diphenyloxazole (PPO) and Lumogen Violet (LV), have been herein produced starting from either the copolymer polydiphenyldimethylsiloxane with 22 mol% of diphenyl groups or from blends of this precursor with different amounts of the homopolymer polymethylphenylsiloxane, thereby ultimately obtaining, after room temperature vulcanization (RTV), siloxane scintillators bearing different amounts of phenyl side groups. The scintillators have been characterized as for optical properties by excitation and fluorescence spectroscopy, while their performances as radiation detectors have been derived from light yield measurements upon irradiation with α particles. Ion beam-induced luminescence (IBIL) has been also applied using a proton beam of 2 MeV to compare the behavior of the different compositions by observing the in-situ degradation rate of the emitting species under ion irradiation. The samples and commercial scintillators (EJ-212 and EJ-200) used as a standard underwent heavy irradiation with γ-rays from a 60Co source at different doses, up to 54 kGy. Then, the ex-situ light yield toward α particles for each scintillator was collected twice again: immediately after the irradiation stage and after one month, in order to characterize the stability and the radiation hardness of scintillators produced with the different blends. © 2012 Elsevier B.V. All rights reserved.
- Published
- 2013
13. Luminescent properties and morphology of ZnWO[4] powders synthesized by hydrothermal method
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Marhabaeva, Aiymgul, Polisadova, Elena Fyodorovna, Lisitsyn, Viktor Mikhailovich, Valiev, Damir Talgatovich, Abdullin, Khabibula, and Nemkaeva, Renata
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люминесцентные свойства ,hydrothermal synthesis ,phase structure ,люминесценция ,гидротермальный синтез ,luminescence ,порошки ,zinc tungstate ,scintillators ,морфология ,цинк ,сцинтилляторы - Published
- 2016
14. Ultrafast emission from colloidal nanocrystals under pulsed X-ray excitation
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Anatolii Polovitsyn, Rosana Martinez Turtos, Iwan Moreels, Joel Q. Grim, Sotirios Christodoulou, E. Auffray, Stefan Gundacker, Matteo Salomoni, Paul Lecoq, MARTINEZ TURTOS, R, Gundacker, S, Polovitsyn, S, Christodoulou, S, Salomoni, M, Auffray, E, Moreels, I, Lecoq, P, and Grim, J
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Photon ,Materials science ,Photoluminescence ,gas and liquid scintillators) ,NANOPLATELETS ,Exciton ,02 engineering and technology ,Scintillator ,XX ,01 natural sciences ,Timing detectors ,Materials for solid-state detector ,SCINTILLATORS ,0103 physical sciences ,Instrumentation ,Mathematical Physics ,010308 nuclear & particles physics ,business.industry ,Hybrid detector ,Hybrid detectors ,TOF-PET ,Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators) ,021001 nanoscience & nanotechnology ,TIME RESOLUTION ,Materials for solid-state detectors ,scintillation and light emission processes (solid ,Physics and Astronomy ,Timing detector ,Quantum dot ,Excited state ,QUANTUM-DOT ,LUMINESCENCE ,Optoelectronics ,Light emission ,GAIN ,0210 nano-technology ,business ,Luminescence - Abstract
Fast timing has emerged as a critical requirement for radiation detection in medical and high energy physics, motivating the search for scintillator materials with high light yield and fast time response. However, light emission rates from conventional scintillation mechanisms fundamentally limit the achievable time resolution, which is presently at least one order of magnitude slower than required for next-generation detectors. One solution to this challenge is to generate an intense prompt signal in response to ionizing radiation. In this paper, we present colloidal semiconductor nanocrystals (NCs) as promising prompt photon sources. We investigate two classes of NCs: two-dimensional CdSe nanoplatelets (NPLs) and spherical CdSe/CdS core/giant shell quantum dots (GS QDs). We demonstrate that the emission rates of these NCs under pulsed X-ray excitation are much faster than traditional mechanisms in bulk scintillators, i.e. 5d-4f transitions. CdSe NPLs have a sub-100 ps effective decay time of 77 ps and CdSe/CdS GS QDs exhibit a sub-ns value of 849 ps. Further, the respective CdSe NPL and CdSe/CdS GS QD X-ray excited photoluminescence have the emission characteristics of excitons (X) and multiexcitons (MX), with the MXs providing additional prospects for fast timing with substantially shorter lifetimes.
- Published
- 2016
15. Suppression of Host Luminescence in the Pr:LuAG Scintillator
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Anna Vedda, Kohji Kishio, Fumio Saito, Jun-ichi Shimoyama, J. Pejchal, Akira Yoshikawa, Kei Kamada, M. Nikl, J.A. Mares, Hiraku Ogino, Ogino, H, Kamada, K, Yoshikawa, A, Saito, F, Pejchal, J, Mares, J, Nikl, M, Vedda, A, Shimoyama, J, and Kishio, K
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Quenching ,Nuclear and High Energy Physics ,Materials science ,Exciton ,Analytical chemistry ,garnet ,chemistry.chemical_element ,Crystal growth ,scintillators ,Radioluminescence ,Scintillator ,Thermoluminescence ,FIS/01 - FISICA SPERIMENTALE ,Nuclear Energy and Engineering ,chemistry ,luminescence ,Electrical and Electronic Engineering ,Gallium ,Luminescence ,FIS/03 - FISICA DELLA MATERIA - Abstract
Effect of Ga substitution in the (Lu, Pr) 3Al 5O 12(Pr : LuAG) scintillator was examined at the crystals grown by the micropulling down (μ-PD) method. Host luminescence due to an exciten localized around the Lu-Al antisite defect was suppressed by Ga admixture. Concentration depenendence was investigated and suppression was observed even at the lowest Ga concentration of 5 mol%. Faster decay time as well as less intense slower components were obtained upon increasing the amount of Ga. In the thermostimulated luminescence measurement, the glow curve peaks are gradually shifted to lower temperatures with the gallium admixture, and noticeable intensity decrease was observed only for the (Lu, Pr) 3(Ga 0.2Al 0.8) 5O 12. The undesired quenching effect of Ga on the Pr 3+ luminescence seems to be reasonably low up to (Lu, Pr) 3(Ga 0.2Al 0.8) 5O 12 sample. It is estimated to introduce nonradiative losses of less than 10% with respect to Ga-free Pr:LuAG. Bulk crystals were also grown by the Czochralski (Cz) method and these effects were confirmed. © 2008 IEEE.
- Published
- 2008
16. Investigation of Ce-doped Gd2Si2O7 as a scintillator material
- Author
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Kazuhisa Kurashige, S. Kawamura, Hiroyuki Ishibashi, Junichi Kaneko, Fumiyuki Fujita, Michihiro Furusaka, A. Homma, Mikio Higuchi, Shohei Saeki, and J. Haruna
- Subjects
Physics ,Nuclear and High Energy Physics ,Scintillation ,neutron detectors ,Doping ,Analytical chemistry ,gadolinium compounds ,scintillators ,Alpha particle ,Crystal structure ,Triclinic crystal system ,Scintillator ,Particle detector ,Gd2Si2O7 ,radiation detectors ,Luminescence ,Instrumentation - Abstract
As a novel scintillation material, the use of Ce-doped Gd_{2}Si_{2}O_{7} was investigated. In fact, (Gd_{0.9}Ce_{0.1})_{2}Si_{2}O_{7} powder showed about five-times greater light output than Gd_{2}SiO_{5} (GSO) powder samples for alpha-particles from ^{241}Am. Furthermore, a fast decay constant of 59 ns was obtained for alpha-particles from ^{241}Am. Relations between the Ce-concentration, crystal structure and luminescence characteristics were also elucidated. Results of these studies show that heavy Ce-doping alters the Gd_{2}Si_{2}O_{7} crystal structure and that the luminescence intensity is dependent not on Ce-concentration but on the triclinic structure formed by heavy Ce-doping.
- Published
- 2007
17. Development and underground test of radiopure ZnMoO4 scintillating bolometers for the LUMINEU 0 nu 2 beta project
- Author
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J. Gascon, R. J. Walker, O. Plantevin, A. A. Drillien, V.N. Shlegel, M. Gros, S. Marnieros, K. Eitel, V. Kozlov, Christian Enss, M. Kleifges, B. Paul, T. de Boissière, C. Nones, C. Augier, L. Hehn, E. Olivieri, E. Yakushev, P. Coulter, C. Kéfélian, V. Humbert, G. Gerbier, M. Rodrigues, M. Chapellier, N. Foerster, A. Giuliani, S. Scorza, V. B. Brudanin, G. Heuermann, T. Redon, F. Koskas, L. Dumoulin, P. de Marcillac, Claire A. Marrache-Kikuchi, P. Magnier, S. Hervé, N. Fourches, L. Vagneron, H. Kraus, V.N. Zhdankov, A. Menshikov, M.-C. Piro, Max Robinson, Y. Penichot, X-F. Navick, Matias Velázquez, I.M. Ivanov, V. V. Kobychev, P. Pari, A. Broniatowski, R. Decourt, A. Cazes, D. Filosofov, A. Fleischmann, Oudomsack Viraphong, O. Strazzer, Denis Tcherniakhovski, G. Pessina, D. Gray, L. Gastaldo, Noël Coron, M. Loidl, Ph. Camus, L. Bergé, Alain Benoit, E.P. Makarov, V. A. Kudryavtsev, D.M. Chernyak, S. Henry, E. Armengaud, L. Devoyon, B. Schmidt, F.A. Danevich, Ya.V. Vasiliev, J. Blümer, M. Mancuso, R.S. Boiko, M. De Jesus, M. Tenconi, S. V. Rozov, Marc Weber, D.V. Poda, V.I. Tretyak, H. Kluck, T. Bergmann, Q. Arnaud, H. Le Sueur, X. Zhang, V. Sanglard, B. Siebenborn, A. Juillard, S.G. Nasonov, F. Charlieux, L. Torres, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Hélium : du fondamental aux applications (HELFA), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Kiev Institute for Nuclear Research (KINR), Ukrainian Academy of Sciences, Karlsruhe Institute of Technology (KIT), Dzhelepov Laboratory of Nuclear Problems [Dubna] (DLNP), Joint Institute for Nuclear Research (JINR), Cryogénie (Cryo), Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), University of Oxford [Oxford], Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Karlsruher Institut für Technologie (KIT), Kirchhoff Institute for Physics, Universität Heidelberg [Heidelberg], Nikolaev Institute of Inorganic Chemistry [Novosibirsk] (NIC), Siberian Branch of the Russian Academy of Sciences (SB RAS), University of Sheffield [Sheffield], Laboratoire National Henri Becquerel (LNHB), Département Métrologie Instrumentation & Information (DM2I), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Istituto Nazionale di Fisica Nucleare, Sezione di Milano (INFN), Istituto Nazionale di Fisica Nucleare (INFN), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), CML Ltd, ANR-12-BS05-0004,LUMINEU,Expérience souterraine avec détecteurs luminescents de molybdate de zinc pour l'étude de la masse et la nature des neutrinos(2012), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Hélium : du fondamental aux applications (NEEL - HELFA), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Cryogénie (NEEL - Cryo), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), University of Oxford, Universität Heidelberg [Heidelberg] = Heidelberg University, Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département d'instrumentation Numérique (DIN (CEA-LIST)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), HELFA - Hélium : du fondamental aux applications, Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), CSNSM PS1, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Laboratory of Particle Physics (JINR-DUBNA), Joint Institute for Nuclear Research, Cryo - Cryogénie, Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Direction de Recherche Technologique (CEA) (DRT (CEA)), Institut Rayonnement Matière de Saclay (IRAMIS), Istituto Nazionale di Fisica Nucleare [Milano] (INFN), Joint Institute for Nuclear Research - Dubna, ANR-12-BS05-004,LUMINEU,Luminescent Underground Molybdenum Investigation for NEUtrino mass and nature, Armengaud, E, Arnaud, Q, Augier, C, Benoit, A, Berge, L, Boiko, R, Bergmann, T, Blumer, J, Broniatowski, A, Brudanin, V, Camus, P, Cazes, A, Chapellier, M, Charlieux, F, Chernyak, D, Coron, N, Coulter, P, Danevich, F, De Boissiere, T, Decourt, R, Jesus, M, Devoyon, L, Drillien, A, Dumoulin, L, Eitel, K, Enss, C, Filosofov, D, Fleischmann, A, Foerster, N, Fourches, N, Gascon, J, Gastaldo, L, Gerbier, G, Giuliani, A, Gray, D, Gros, M, Hehn, L, Henry, S, Herve, S, Heuermann, G, Humbert, V, Ivanov, I, Juillard, A, Kefelian, C, Kleifges, M, Kluck, H, Kobychev, V, Koskas, F, Kozlov, V, Kraus, H, Kudryavtsev, V, Sueur, H, Loidl, M, Magnier, P, Makarov, E, Mancuso, M, De Marcillac, P, Marnieros, S, Marrache-Kikuchi, C, Menshikov, A, Nasonov, S, Navick, X, Nones, C, Olivieri, E, Pari, P, Paul, B, Penichot, Y, Pessina, G, Piro, M, Plantevin, O, Poda, D, Redon, T, Robinson, M, Rodrigues, M, Rozov, S, Sanglard, V, Schmidt, B, Scorza, S, Shlegel, V, Siebenborn, B, Strazzer, O, Tcherniakhovski, D, Tenconi, M, Torres, L, Tretyak, V, Vagneron, L, Vasiliev, Y, Velazquez, M, Viraphong, O, Walker, R, Weber, M, Yakushev, E, Zhang, X, and Zhdankov, V
- Subjects
gas and liquid scintillators) ,Zinc molybdate ,Cryogenic detector ,EDELWEISS ,Scintillator ,01 natural sciences ,Nuclear physics ,CRYSTAL SCINTILLATORS ,chemistry.chemical_compound ,Double beta decay ,0103 physical sciences ,Dilution refrigerator ,[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] ,[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] ,010306 general physics ,Instrumentation ,GRADIENT CZOCHRALSKI TECHNIQUE ,Mathematical Physics ,Physics ,TUNGSTATES ,010308 nuclear & particles physics ,Hybrid detector ,DOUBLE-BETA-DECAY ,Hybrid detectors ,Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators) ,Double-beta decay detectors ,Double-beta decay detector ,DARK-MATTER SEARCH ,scintillation and light emission processes (solid ,RADIOACTIVE CONTAMINATION ,Cryogenic detectors ,chemistry ,Scintillators ,LUMINESCENCE ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,PARTICLE PHYSICS ,GROWTH ,SINGLE-CRYSTALS ,Neutrino ,Isotopes of thorium ,Radioactive decay - Abstract
International audience; The LUMINEU (Luminescent Underground Molybdenum Investigation for NEUtrino mass and nature) project envisages a high-sensitivity search for neutrinoless double beta (0 nu 2 beta) decay of Mo-100 with the help of scintillating bolometers based on zinc molybdate (ZnMoO4) crystals. One of the crucial points for the successful performance of this experiment is the development of a protocol for producing high quality large mass ZnMoO4 crystal scintillators with extremely high internal radiopurity. Here we report a significant progress in the development of large volume ZnMoO4 crystalline boules (with mass up to 1 kg) from deeply purified materials. We present and discuss the results achieved with two ZnMoO4 samples (with mass of about 0.3 kg each): one is a precursor of the LUMINEU project, while the other one was produced in the framework of LUMINEU with an improved purification / crystallization procedure. The two crystals were measured deep underground as scintillating bolometers in the EDELWEISS dilution refrigerator at the Laboratoire Souterrain de Modane (France) protected by a rock overburden corresponding to 4800 m w.e. The results indicate that both tested crystals are highly radiopure. However, the advanced LUMINEU sample shows a clear improvement with respect to the precursor, exhibiting only a trace internal contamination related with Po-210 at the level of 1 mBq/kg, while the activity of Ra-226 and Th-228 is below 0.005 mBq/kg. This demonstrates that the LUMINEU purification and crystal-growth procedures are very efficient and leads to radiopurity levels which exceedingly satisfy not only the LUMINEU goals but also the requirements of a next-generation 0 nu 2 beta experiment.
- Published
- 2015
18. Effect of the activator impurity on the scintillation yield in alkali-halide crystals
- Author
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Gektin, A., Gridin, Sergii, Vasyukov, S., Vasil'Ev, A., Belsky, Andrei, Shiran, N., Institute for Scintillation Materials of NASU, National Academy of Sciences of Ukraine (NASU), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), D.V. Skobeltsyn Institute of Nuclear Physics (SINP), and Lomonosov Moscow State University (MSU)
- Subjects
[PHYS]Physics [physics] ,[SPI]Engineering Sciences [physics] ,Luminescence ,Physics::Instrumentation and Detectors ,Scintillators ,Alkali halides ,Single crystals ,[CHIM]Chemical Sciences - Abstract
International audience; The influence of different activator impurities on the scintillation yield of alkali halides has been investigated as a function of temperature. Luminescence spectra of pure and activated CsI and NaI scintillation crystals were measured under X‐ray and VUV excitation at temperatures from 10 to 300 K. In indium‐ and thallium‐doped crystals activator centers can capture electrons. Along with self‐trapping of holes at low temperatures, electron capture by the dopant results in energy storage. This leads to a significant decrease of luminescence yield. In Eu‐doped NaI and CsI crystals activator centers capture a hole first. In this way, at low temperatures electrons recombine either with self‐trapped holes (yielding STE emission), or with holes trapped by the activator (giving rise to Eu emission band). No energy loss at low temperature is evident in CsI:Eu and NaI:Eu crystals.
- Published
- 2015
19. Current trends in scintillator detectors and materials
- Author
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William W. Moses
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Physics ,Nuclear and High Energy Physics ,Physics::Instrumentation and Detectors ,business.industry ,Resolution (electron density) ,chemistry.chemical_element ,Phosphor ,scintillators ,Scintillator ,Lutetium ,Positron ,chemistry ,Optoelectronics ,Luminous efficacy ,business ,Luminescence ,Instrumentation ,Radiation hardening - Abstract
The last decade has seen a renaissance in inorganic scintillator development for gamma ray detection. Lead tungstate (PbWO4) has been developed for high energy physics experiments, and possesses exceptionally high density and radiation hardness, albeit with low luminous efficiency. Lutetium orthosilicate or LSO (Lu2SiO5:Ce) possesses a unique combination of high luminous efficiency, high density, and reasonably short decay time, and is now incorporated in commercial positron emission tomography (PET) cameras. There have been advances in understanding the fundamental mechanisms that limit energy resolution, and several recently discovered materials (such as LaBr3:Ce) possess energy resolution that approaches that of direct solid state detectors. Finally, there are indications that a neglected class of scintillator materials that exhibit near band-edge fluorescence could provide scintillators with sub-nanosecond decay times and high luminescent efficiency.
- Published
- 2002
20. Trapping states and excited state ionization of the Ce3+ activator in the SrHfO3 host
- Author
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Anna Vedda, Mauro Fasoli, E. Mihokova, Alessandro Lauria, V. Jarý, Martin Nikl, Federico Moretti, Mihóková, E, Jarý, V, Fasoli, M, Lauria, A, Moretti, F, Nikl, M, and Vedda, A
- Subjects
Chemistry ,General Physics and Astronomy ,Thermal ionization ,Trapping ,scintillators ,Atmospheric temperature range ,Thermoluminescence ,cerium ,FIS/01 - FISICA SPERIMENTALE ,Excited state ,Ionization ,ddc:540 ,Activator (phosphor) ,Physical and Theoretical Chemistry ,Atomic physics ,Luminescence ,thermoluminescence - Abstract
We study trapping states of Ce 3+ -doped SrHfO 3 by thermally stimulated luminescence in a wide temperature range (10–730 K). We determine characteristic parameters of the traps by the initial rise technique. We also determine the energy of thermal ionization of the excited state of Ce 3+ in SrHfO 3 host by purely optical method based on the study of UV illumination-induced thermoluminescence. The method provides a value of the thermal ionization energy of about 0.25 eV.
- Published
- 2013
21. Structural and optical properties of Vernier phase lutetium oxyfluorides doped with lanthanide ions: interesting candidates as scintillators and X-ray phosphors
- Author
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Adolfo Speghini, Vitezslav Jary, M. Nikl, Anna Vedda, Tiziana Passuello, Fabio Piccinelli, Valerio Causin, Dariusz Hreniak, Malgorzata Guzik, Marco Giarola, Marco Bettinelli, Mauro Fasoli, Lukasz Marciniak, Gino Mariotto, M. Trevisani, Passuello, T, Piccinelli, F, Trevisani, M, Giarola, M, Mariotto, G, Marciniak, L, Hreniak, D, Guzik, M, Fasoli, M, Vedda, A, Jary, V, Nikl, M, Causin, V, Bettinelli, M, and Speghini, A
- Subjects
Lanthanide ,Materials science ,Band gap ,Doping ,Analytical chemistry ,chemistry.chemical_element ,Phosphor ,luthetium oxyfluorides ,oxyfluoride ,General Chemistry ,Radioluminescence ,scintillators ,Lutetium ,Vernier phases ,lanthanide ions doping ,FIS/01 - FISICA SPERIMENTALE ,chemistry ,Materials Chemistry ,luminescence ,rare earth ions ,Emission spectrum ,Powder diffraction - Abstract
Undoped, Ce3+, Pr3+ and Eu3+ doped lutetium oxyfluoride submicrometre powders have been prepared by a simple coprecipitation procedure in water. The synthesized samples are Vernier single phases with a stoichiometry assigned to Lu10O9F12, as demonstrated by X-ray powder diffraction. The structural disorder of the host matrix significantly affects the optical emission spectra of the lanthanide doped samples as well as their vibrational spectra. The observed bandwidths of the FTIR spectrum and Raman scattering of the undoped sample are consistent with a very disordered nature of the host. From an analysis of the emission spectra of the Eu3+ doped sample it was found that different sites accommodating the lanthanide ions are present in the crystal structure. The Pr3+ and Ce3+ doped oxyfluoride samples show radioluminescence emission both in the UV and visible regions. The UV emission is due to lanthanide 4d-5f transitions, differently from the behavior observed for Ce3+ and Pr3+ doped Lu2O3, showing no UV emission. Considering the high mass density (close to 9 g cm(-3)), and the suitable location of rare earth ion electronic levels in the material band gap, as demonstrated by the observation of radiative emissions for all activators, the materials under investigation can be considered interesting candidates for scintillator or phosphor materials in the UV and visible regions.
- Published
- 2012
22. The Harmful Effects of Sintering Aids in Pr:LuAG Optical Ceramic Scintillator
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A. Krasnikov, Yubai Pan, Martin Nikl, Anna Vedda, Yanping Zeng, Jiang Li, Yiqiang Shen, Xiqi Feng, Federico Moretti, Yun Shi, Shen, Y, Shi, Y, Feng, X, Pan, Y, Li, J, Zeng, Y, Nikl, M, Krasnikov, A, Vedda, A, and Moretti, F
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Scintillation ,Materials science ,business.industry ,Sintering ,Mineralogy ,scintillators ,Scintillator ,Crystallographic defect ,optical propertie ,optical ceramic ,FIS/01 - FISICA SPERIMENTALE ,Condensed Matter::Superconductivity ,visual_art ,Materials Chemistry ,Ceramics and Composites ,Transmittance ,visual_art.visual_art_medium ,Optoelectronics ,Charge carrier ,Ceramic ,Luminescence ,business - Abstract
We investigate scintillation properties and energy trapping processes in Pr-doped Lu 3Al 5O 12(Pr:LuAG) optical ceramics, specifically focusing on the effects of sintering aids. Ceramics with good transmittance and scintillation properties comparable with those of single crystals were obtained without the use of sintering aids. Their introduction caused a transparency improvement, accompanied, however, by a deterioration of scintillation properties in terms of light yield and time decay. We interpret the results, discussing the role of aliovalent sintering agents on the formation of point defects acting as traps affecting the transport of charge carriers to the luminescence centers.
- Published
- 2012
23. Optimizing the energy threshold of light detectors coupled to luminescent bolometers
- Author
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G. Piperno, Stefano Pirro, and M. Vignati
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Physics - Instrumentation and Detectors ,gas and liquid scintillators) ,Physics::Instrumentation and Detectors ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Photon energy ,Scintillator ,Noise (electronics) ,Analysis and statistical methods ,Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators) ,Superconductive detectors (bolometers, tunnel junctions etc) ,law.invention ,High Energy Physics - Experiment ,High Energy Physics - Experiment (hep-ex) ,law ,Double beta decay ,Instrumentation ,Mathematical Physics ,Astrophysics::Galaxy Astrophysics ,Physics ,Scintillation ,business.industry ,Bolometer ,Detector ,tunnel junctions etc) ,Astrophysics::Instrumentation and Methods for Astrophysics ,Instrumentation and Detectors (physics.ins-det) ,Superconductive detectors (bolometers ,scintillation and light emission processes (solid ,Physics - Data Analysis, Statistics and Probability ,Scintillators ,Optoelectronics ,High Energy Physics::Experiment ,business ,Luminescence ,Data Analysis, Statistics and Probability (physics.data-an) - Abstract
Bolometers have proven to be good detectors for the search of neutrinoless double beta decay. By operating at cryogenic temperatures, they feature excellent energy resolution and low background. The detection of the possible light emitted when particles interact in the bolometer is a promising method to lower the background of the experiments. The different amount of light emitted in beta/gamma and alpha interactions, whether due to scintillation or Cerenkov emission, allows to discriminate the two interaction types. Because of the cryogenic environment, light detectors are often bolometers. In this work we present a software algorithm to lower the energy threshold of bolometric light detectors coupled to luminescent bolometers. The application to data from Ge light detectors coupled to ZnMoO4 and TeO2 bolometers shows that the energy threshold can be lowered substantially, increasing the discrimination power when the amount of emitted light is small., Comment: 12 pages, 8 figures
- Published
- 2011
- Full Text
- View/download PDF
24. Fast UV luminescence in $Pr^ {3+}$-doped eulytite double phosphates
- Author
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Marco Bettinelli, Adolfo Speghini, Fabio Piccinelli, Konstantin V. Ivanovskikh, Andries Meijerink, and C. Ronda
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Materials science ,Energy transfer ,Organic Chemistry ,Doping ,Relaxation (NMR) ,Analytical chemistry ,Synchrotron radiation ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Ion ,Phosphates ,Inorganic Chemistry ,Scintillators ,Lanthanide ions ,ddc:530 ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,Luminescence ,Spectroscopy ,Excitation - Abstract
The paper presents the synthetic procedure and the structural characterisation of Pr3+-doped eulytite double phosphates Sr3La(PO4)3 and Ba3Lu(PO4)3. The luminescence properties of these materials were studied employing time-resolved VUV spectroscopy upon excitation with synchrotron radiation. The 5d-4f emission of Pr3+ ions was detected and assigned. It was shown that energy transfer from host to Pr3+ 5d states is quite inefficient. At the same time the materials demonstrate unwanted defect-related emission that presents main path for relaxation of host relaxation excitations.
- Published
- 2011
25. Gd-incorporation and luminescence properties in sol-gel silica glasses
- Author
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Carlo B. Azzoni, Anna Vedda, Mauro Fasoli, Andrea Baraldi, Elisa Buffagni, Martin Nikl, Federico Moretti, D. Di Martino, Norberto Chiodini, Margherita Mazzera, Giuliano Angella, Rosanna Capelletti, DI MARTINO, D, Chiodini, N, Fasoli, M, Moretti, F, Vedda, A, Baraldi, A, Buffagni, E, Capelletti, R, Mazzera, M, Nikl, M, Angella, G, and Azzoni, C
- Subjects
SPECTROSCOPY ,EFFICIENCY ,Dopant ,Chemistry ,Analytical chemistry ,Infrared spectroscopy ,Radioluminescence ,Thermal treatment ,Condensed Matter Physics ,RARE-EARTH IONS ,Electronic, Optical and Magnetic Materials ,Nanoclusters ,Amorphous solid ,sol-gel, clusters, silica ,FIS/01 - FISICA SPERIMENTALE ,SCINTILLATORS ,Materials Chemistry ,Ceramics and Composites ,ELECTRON-SPIN-RESONANCE ,Fourier transform infrared spectroscopy ,Luminescence - Abstract
A thorough study was performed on Gd-doped sol-gel silica glasses, in the concentration range 0-8 mol% Gd. The analyses were carried out as a function of Gd content, before and after a post-densification thermal treatment. Different results concerning optical, vibrational, magnetic, and structural features were gathered in correlated experiments. The presence of Gd-rich nanoclusters was revealed. The size of nanoclusters increases by increasing the dopant concentration and by performing a rapid thermal treatment (RTT) at 1800 °C in air, which causes also a remarkable intensity increase of the 6P7/2 →8S7/2 radioluminescence transition of Gd3+. Nanoclusters are amorphous, possibly close to a Gd2SiO5 stoichiometry as suggested by fast Fourier transform infrared spectroscopy (FTIR). FTIR studies revealed also the presence of Gd-dimers interacting with OH- groups. Moreover, the presence of isolated Gd3+ ions was detected by electron paramagnetic resonance investigations. Based on the results obtained with different techniques, the Gd-incorporation in silica glass host and the resulting optical properties are discussed. © 2008 Elsevier B.V. All rights reserved.
- Published
- 2008
26. Scintillation of Sol-Gel derived Lutetium orthophosphate doped with rare earth ions
- Author
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Christophe Dujardin, Jean-Marie Nedelec, Rachid Mahiou, Christelle Mansuy, Laboratoire des Matériaux Inorganiques (LMI), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Clermont Université-SIGMA Clermont (SIGMA Clermont)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physico-Chimie des Matériaux Luminescents (LPCML), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, LuminiX RNTS LuNaTIC ACI nanostructures, Laboratoire des Matériaux Inorganiques ( LMI ), Université Blaise Pascal - Clermont-Ferrand 2 ( UBP ) -Clermont Université-Sigma CLERMONT ( Sigma CLERMONT ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physico-Chimie des Matériaux Luminescents ( LPCML ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Thermogravimetric analysis ,Materials science ,rare earth ,Analytical chemistry ,chemistry.chemical_element ,02 engineering and technology ,scintillators ,Scintillator ,010402 general chemistry ,01 natural sciences ,Biomaterials ,Materials Chemistry ,luminescence ,Sol-gel ,phosphate ,Scintillation ,General Chemistry ,[CHIM.MATE]Chemical Sciences/Material chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Lutetium ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,Characterization (materials science) ,Amorphous solid ,chemistry ,[ CHIM.MATE ] Chemical Sciences/Material chemistry ,Ceramics and Composites ,0210 nano-technology ,Luminescence - Abstract
In this paper, the synthesis, the characterization and the scintillation properties of LuPO4 doped, with several concentrations of Ce3+, Eu3+ and Tb3+ ions, are presented. These materials have been synthesized by sol-gel process. The purity of powders has been verified by X-Ray diffraction and the results confirm the xenotime structure of all the materials. A thermogravimetric analysis allows the obtention of informations on the crystallisation of LuPO4 and the study of its evolution from the amorphous to crystalline form. The morphology of the powders has been studied by Scanning Electron Microscopy and shows that the powders are constituted of small particles with narrow size distribution. Optical properties have been studied in order to determine the scintillation performances of these materials. The optima are obtained for Ce3+, Eu3+ and Tb3+ concentration of respectively 0.1%, 10% and 5% with high scintillation yields. This study thus confirms the potentialities of these materials as scintillators.
- Published
- 2006
27. Characterization of sol-gel derived scintillating LuBO3 films doped with rare earth ions
- Author
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Christelle Mansuy, Eric Tomasella, Jean Grimblot, Jean-Marie Nedelec, Rachid Mahiou, Léon Gengembre, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Ecole Centrale de Lille-Centre National de la Recherche Scientifique (CNRS)-Université de Lille, Laboratoire des Matériaux Inorganiques (LMI), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Clermont Université-SIGMA Clermont (SIGMA Clermont)-Centre National de la Recherche Scientifique (CNRS), Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Ecole Centrale de Lille-Université d'Artois (UA)-Centrale Lille Institut (CLIL), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Clermont Université-SIGMA Clermont (SIGMA Clermont)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de catalyse de Lille - UMR 8010 (LCL), Université de Lille, Sciences et Technologies-Centrale Lille-Centre National de la Recherche Scientifique (CNRS), and LuminiX RNTS LuNaTIC ACI NAnostructures
- Subjects
Materials science ,Mineralogy ,02 engineering and technology ,scintillators ,engineering.material ,010402 general chemistry ,01 natural sciences ,law.invention ,Coating ,X-ray photoelectron spectroscopy ,law ,Materials Chemistry ,luminescence ,sol-gel ,Thin film ,Crystallization ,Sol-gel ,Spin coating ,Metals and Alloys ,Surfaces and Interfaces ,[CHIM.MATE]Chemical Sciences/Material chemistry ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,PACS: 78.55.Hx, 81.15.Rs, 81.20. Fw ,Carbon film ,Chemical engineering ,Amorphous carbon ,engineering ,xps ,rare earth ions ,0210 nano-technology ,rbs - Abstract
Rare earth doped LuBO 3 thin films have been prepared by combining sol-gel process and coating techniques such as spin coating and spray pyrolysis. Annealing treatment results in the crystallization of the film as vaterite phase and incorporation of the doping ions in solid solution. XPS and RBS spectroscopies showed that the composition of the films is close to the nominal one. Adventitious carbon has been observed and attributed to incomplete pyrolysis of metal-organic precursors. XPS concentration profiles show a good homogeneity for the films. RBS demonstrated some inter-diffusion between amorphous carbon substrate and borate films resulting in a gradient of carbon at the interface between the substrate and the film itself. Finally scintillation spectra have been recorded and demonstrate the potentiality of these films to be used as X-ray intensifying screens.
- Published
- 2006
28. Purification of molybdenum, growth and characterization of medium volume ZnMoO4crystals for the LUMINEU program
- Author
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E. P. Makarov, V.N. Shlegel, V.Ya. Degoda, V.N. Zhdankov, L. Devoyon, G. Pessina, E. Olivieri, A. A. Drillien, C. Nones, Matias Velázquez, Matias Rodrigues, O. Plantevin, S.G. Nasonov, Oudomsack Viraphong, T. Redon, P. de Marcillac, M. Tenconi, F.A. Danevich, Martin Loidl, V.V. Kobychev, P. Magnier, Noël Coron, Rodolphe Decourt, M. Chapellier, V. Humbert, Y. Penichot, I.M. Ivanov, B. Paul, Loredana Gastaldo, X-F. Navick, O. Strazzer, M. Mancuso, M. Gros, S. Hervé, R. S. Boiko, Achim Fleischmann, A. Giuliani, Christian Enss, Luc Bergé, Ya.P. Kogut, S. Marnieros, F. Koskas, Claire A. Marrache-Kikuchi, D. V. Poda, Ya.V. Vasiliev, D. M. Chernyak, V. I. Tretyak, L. Dumoulin, and L. Torres
- Subjects
gas and liquid scintillators) ,Materials science ,Zinc molybdate ,Radiochemistry ,Refractory metals ,Hybrid detectors ,chemistry.chemical_element ,Crystal growth ,Zinc ,Scintillator ,scintillation and light emission processes (solid ,chemistry.chemical_compound ,Cryogenic detectors ,Photoemission ,Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators) ,chemistry ,Molybdenum ,Scintillators ,Sublimation (phase transition) ,Luminescence ,Instrumentation ,Mathematical Physics - Abstract
The LUMINEU program aims at performing a pilot experiment on neutrinoless double beta decay of 100Mo using radiopure ZnMoO4 crystals operated as cryogenic scintillating bolometers. Growth of high quality radiopure crystals is a complex task, since there are no commercial molybdenum compounds available with the required level of purity and radioactive contamination. This paper discusses approaches to purify molybdenum and synthesize compounds for high quality radiopure ZnMoO4 crystal growth. A combination of a double sublimation (with addition of zinc molybdate) with subsequent recrystallization in aqueous solutions (using zinc molybdate as a collector) was used. Zinc molybdate crystals up to 1.5 kg were grown by the low-thermal-gradient Czochralski technique; their optical, luminescent, diamagnetic, thermal and bolometric properties were tested.
- Published
- 2014
29. Cerium doped heavy metal fluoride glasses, a possible alternative for electromagnetic calorimetry
- Author
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Jean Fay, G. Maze, Francesco Meinardi, Anna Vedda, C. Pedrini, D. Bouttet, M. Schneegans, J.A. Mares, S. Tavernier, Etiennette Auffray, Martin Nikl, M. J. Poulain, Bernard Moine, Paul Lecoq, Marco Martini, I. Dafinei, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Auffray, E, Bouttet, D, Dafinei, I, Fay, J, Lecoq, P, Mares, J, Martini, M, Maze, G, Meinardi, F, Moine, B, Nikl, M, Pedrini, C, Poulain, M, Schneegans, M, Tavernier, S, and Vedda, A
- Subjects
Nuclear and High Energy Physics ,Physics::Instrumentation and Detectors ,chemistry.chemical_element ,glasse ,02 engineering and technology ,scintillators ,Scintillator ,insulator ,01 natural sciences ,Condensed Matter::Disordered Systems and Neural Networks ,Metal ,chemistry.chemical_compound ,Condensed Matter::Materials Science ,0103 physical sciences ,[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] ,Instrumentation ,Radiation hardening ,010302 applied physics ,Physics ,Scintillation ,business.industry ,Doping ,021001 nanoscience & nanotechnology ,Cerium ,optical propertie ,FIS/01 - FISICA SPERIMENTALE ,chemistry ,visual_art ,visual_art.visual_art_medium ,Optoelectronics ,0210 nano-technology ,business ,Luminescence ,Fluoride ,Particle Physics - Experiment - Abstract
The article is an overview of the research activity made in the framework of the Crystal Clear Collaboration aimed at obtaining scintillating glasses able to fit the constraints imposed for the active medium of the central Electromagnetic Calorimeter at CMS, The manufacturing of heavy metal fluoride glasses doped with Ce3+ is discussed. The luminescence and scintillation characteristics as well as the radiation hardness properties are extensively studied in the case of Ce doped fluorohafnate, found to be the most convenient glass scintillator for high energy physics applications.
- Published
- 1996
30. Effect of Mg 2+ ions co-doping on luminescence and defects formation processes in Gd 3 (Ga,Al) 5 O 12 :Ce single crystals
- Author
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Aleksejs Zolotarjovs, S. Zazubovich, Miroslav Kučera, Martin Nikl, Larisa Grigorjeva, Vladimir Babin, and P. Bohacek
- Subjects
Luminescence ,Photoluminescence ,Materials science ,Analytical chemistry ,Mg2+ ,02 engineering and technology ,Crystal structure ,01 natural sciences ,Inorganic Chemistry ,Ce3+ ,0103 physical sciences ,NATURAL SCIENCES:Physics [Research Subject Categories] ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,Spectroscopy ,Multicomponent garnets ,010302 applied physics ,Organic Chemistry ,Doping ,Radioluminescence ,Atmospheric temperature range ,021001 nanoscience & nanotechnology ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Photoexcitation ,Crystallography ,Absorption band ,Scintillators ,Single crystals ,0210 nano-technology - Abstract
The work was supported by the Institutional Research Funding IUT02-26 of the Estonian Ministry of Education and Research and the project 16-15569S of the Czech Science Foundation., Photo- and radioluminescence and thermally stimulated luminescence characteristics of Ce³⁺ - doped and Ce³⁺, Mg²⁺ co-doped Gd3(Ga,Al)5O12 (GAGG) single crystals of similar composition are investigated in the 9–500 K temperature range. The Ce³⁺ - related luminescence spectra and the photoluminescence decay kinetics in these crystals are found to be similar. Under photoexcitation in the Ce³⁺ - and Gd³⁺ - related absorption bands, no prominent rise of the photoluminescence intensity in time is observed neither in GAGG:Ce,Mg nor in GAGG:Ce crystals. The afterglow is strongly reduced in GAGG:Ce,Mg as compared to GAGG:Ce, and the afterglow decay kinetics is much faster. Co-doping with Mg²⁺ results in a drastic decrease of the thermally stimulated luminescence (TSL) intensity in the whole investigated temperature range and in the appearance of a new complex Mg²⁺ - related TSL glow curve peak around 285 K. After irradiation in the Ce³⁺ - related 3.6 eV absorption band, the TSL intensity in GAGG:Ce,Mg is found to be comparable with that in the GAGG:Ce epitaxial film of similar composition. The Mg²⁺ - induced changes in the concentration, origin and structure of the crystal lattice defects and their influence on the scintillation characteristics of GAGG:Ce,Mg are discussed., Estonian Ministry of Education and Research IUT02-26; Czech Science Foundation 16-15569S; Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART²
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- View/download PDF
31. Luminescence résolue en temps de solides cristallins et de nano particules excités par des impulsions IR, UV et VUV femtosecondes d'intensité variable
- Author
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FEDOROV, Nikita, Martin, Patrick, and Belsky, Andrei
- Subjects
Femtosecond laser ,Luminescence ,High order harmonic generation ,Scintillators ,Large gap diélectriques ,Wide gap dielectrics ,Harmoniques d’ordre élevé ,Laser femtoseconde ,Scintillateurs
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