7 results on '"Emissive"'
Number of results to display per page
Search Results
2. Matrix Encapsulation of Solution-Processed Thiophene-Based Fluorophores for Enhanced Red and Green Amplified Spontaneous Emission
- Author
-
Han Y., Sun C., Bai L., Zuo Z., Xu M., Yu M., An X., Wei C., Lin J., Wang N., Ou C., Xie L., Ding X., Cabanillas-Gonzalez J., Huang W. and Yamin Han Chen Sun Lubing Bai Zongyan Zuo Man Xu Mengna Yu Xiang An Chuanxin Wei Jinyi Lin iamjylin@njtech.edu.cn Ning Wang Changjin Ou Linghai Xie Xuehua Ding Juan Cabanillas-Gonzalez juan.cabanillas@imdea.org Wei Huang wei-huang@njtech.edu.cn Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM) & School of Physical and Mathematical Sciences Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 China Centre for Molecular Systems and Organic Devices (CMSOD) Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) Nanjing University of Posts & Telecommunications 9 Wenyuan Road Nanjing 210023 China Madrid Institute for Advanced Studies (IMDEA Nanociencia) Ciudad Universitaria de Cantoblanco Calle Faraday 9 Madrid 28049 Spain Shaanxi Institute of Flexible Electronics (SIFE) Northwestern Polytechnical University (NPU) 127 West Youyi Road Xi'an Shaanxi 710072 China amplified spontaneous emissions ultrafast transient absorption spectroscopy intramolecular excited states matrix encapsulation thiophene-based fluorophores National Natural Science Foundation of China 61874053 61805117 21502091 21502092 21774061 National Key Basic Research Program of China (973) 2015CB932200 Natural Science Funds of the Education Committee of Jiangsu Province 18KJA430009 Natural Science Foundation of Jiangsu Province BK20171470 'High-Level Talents in Six Industries' of Jiangsu Province XYDXX-019 Key Laboratory for Organic Electronics State Key Laboratory of Supramolecular Structure and Materials sklssm2019017 Program for Postgraduates Research Innovation in University of Jiangsu Province KYCX17-0752 KYCX18-1121 Spanish Ministry of Economy and Competitiveness MAT2014-57652-C2-1 2-R (LAPSEN) PCIN-2015-169-C02-01/02 (MOFSENS) Severo Ochoa Programme for Centers of Excellence SEV-2016-0686 Campus of International Excellence (CEI) UAM+CSIC. J. C-G. China Scholarship Council 201608390023 Supplementary Precise control of exciton behavior is key in constructing high?performance material systems for optoelectronic applications. Intrinsic sulfur in building aromatic units always results in strong aggregation, which causes exciton quenching, polaron formation, and enhanced nonradiative components. Herein, a series of solution?processed thiophene?based diarylfluorene derivatives is demonstrated and these fluorophores are encapsulated in the matrix system to suppress polaron formation for efficient green and red amplified spontaneous emission (ASE). A systematic photophysical study in solution, neat films, and polystyrene (PS)?based encapsulated systems reveals that their emission behaviors are substantially promoted in PS encapsulated matrix due to the suppressed intermolecular aggregation. Furthermore, fs?transient absorption (TA) measurements confirm that the encapsulated systems present stimulated emission (SE) and obtain the same intramolecular excited?state character to those in solution, associated with the effective suppression of polaron formation and exciton quenched, in opposition to neat films with broad photoinduced absorption (PA) bands. Therefore, in contrast to the neat spin?coated film without gain processing, these encapsulated systems give rise to notable optical gain properties with threshold values for green and red ASE as low as 70??J?cm ?2 . Molecular encapsulation is an effective strategy to precisely enhance exciton behavior and emission efficiency for optoelectronic applications. Amplified spontaneous emission (ASE) properties of four sulfur?containing diarylfluorene derivatives (i.e., MC8?BT, MC8?TBT, MC6Cz?BT, and MC6Cz?TBT) are investigated. High?quality spin?coated films with promoted photoluminescence quantum efficiency values are obtained as a result of intramolecular emission confined in the polystyrene (PS) matrix. Furthermore, PS?doped films exhibit a rather low ASE threshold. In light?emitting devices, intermolecular interactions often result in color impurity, spectral instability, and lower luminescence efficiency, which are undesirable for organic lasers and organic light?emitting diodes (OLEDs). In particular, a major challenge for solution?processed thiophene (Th)?based donor–acceptor emitters is their low photoluminescence quantum efficiency (PLQE) in the solid state, which drops to less than ?4% from ?40% typically observed in solution. Beyond the nonradiative decay paths at the single molecule level, new PLQE loss mechanisms appear in the condensed state, such as the formation of weakly emissive intermolecular states or diffusion?assisted quenching processes involving exciton trapping and dissociation, singlet–singlet, and singlet–triplet annihilation. Blocking exciton diffusion by inducing spatial exciton confinement has shown to be effective in promoting the photoluminescence and optical gain properties of conjugated polymers. Luminescence quenching caused by the intermolecular coupling of excited states can be efficiently suppressed by spatially confining the fluorophores into host matrices. Matrix dispersion of conjugated molecules can, in addition, endow the blend with excellent processability, mechanical, and environmental stability properties of interest for optoelectronic devices. The performance of organic optoelectronic devices depends significantly on the film nanostructure. a. The asymmetric substitutions on either side of the fluorene not only merely introduce large steric hindrance (9?position) but also enhance the solution processability (4?position). With the aim to enhance the light?emitting properties of the compounds, we encapsulated the luminescent molecules in polystyrene (PS) (Scheme b), observing amplified spontaneous emission (ASE) with remarkably low thresholds, in contrast with ASE absence in neat films. Ultrafast transient absorption (TA) spectroscopy was deployed in combination with ASE measurements on the solution, neat films, and matrix system to elucidate the molecular encapsulation and confinement effect on the photophysics and optical gain properties of the novel compounds. In neat films, the absence of stimulated emission (SE) is concomitant with a new photoinduced absorption (PA) band which confirms the interplay of absorbing intermolecular excited states. The encapsulation of Th?based molecules in PS restores the SE band primarily observed in solution and confirms that intermolecular excited states play no significant role in blends. In this work, we synthesized two series of novel green and red fluorescent molecules via the Suzuki reaction based on the platform of diarylfluorene, MC8?BT, MC8?TBT, MC6Cz?BT, and MC6Cz?TBT, as shown in Scheme a) Chemical structures of novel Th?based diarylfluorene compounds. b) Schematic illustration of the matrix encapsulation in PS and the characterization of the ASE properties of blends.
- Published
- 2020
3. Discovery of a big void in Khufu’s Pyramid by observation of cosmic-ray muons
- Author
-
Nobuko Kitagawa, Emmanuel Guerriero, Nicolas Serikoff, Yoshikatsu Date, P. Magnier, Vincent Steiger, Yasser El-Shayeb, M. Riallot, H. Fujii, Simon Bouteille, Christopher Filosa, David Attié, Fumihiko Takasaki, Kohei Hayashi, Pierre Gable, Hany Helal, Mehdi Tayoubi, Kunihiro Morishima, Kotaro Satoh, D. Calvet, Makiko Sugiura, Shigeru Odaka, Mustapha Ezzy, Mitsuaki Kuno, Yuta Manabe, Tamer Elnady, S. Procureur, Jean-Baptiste Mouret, Akira Nishio, Hideyo Kodama, Bernard Charles, I. Mandjavidze, Benoit Marini, M. Moto, Department of Physics [Nagoya], Nagoya University, KEK (High energy accelerator research organization), 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 HIP (Héritage – Innovation – Préservation), Emissive, NEP [Tokyo], Suave images [Tokyo], Cairo University, Université Ain Shams, Lifelong Autonomy and interaction skills for Robots in a Sensing ENvironment (LARSEN), Inria Nancy - Grand Est, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Department of Complex Systems, Artificial Intelligence & Robotics (LORIA - AIS), Laboratoire Lorrain de Recherche en Informatique et ses Applications (LORIA), Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire Lorrain de Recherche en Informatique et ses Applications (LORIA), Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL), Dassault Systèmes, ANR-11-IDEX-0003,IPS,Idex Paris-Saclay(2011), Institut National de Recherche en Informatique et en Automatique (Inria)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche en Informatique et en Automatique (Inria)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Laboratoire Lorrain de Recherche en Informatique et ses Applications (LORIA), and Institut National de Recherche en Informatique et en Automatique (Inria)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Physics ,Void (astronomy) ,Physics - Instrumentation and Detectors ,Multidisciplinary ,Muon ,Muon tomography ,010308 nuclear & particles physics ,Cosmic ray muons ,FOS: Physical sciences ,Astronomy ,Cosmic ray ,Instrumentation and Detectors (physics.ins-det) ,01 natural sciences ,0103 physical sciences ,Muography ,Archaeological heritage ,Nuclear emulsion ,[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] ,010306 general physics - Abstract
The Great Pyramid or Khufu's Pyramid was built on the Giza Plateau (Egypt) during the IVth dynasty by the pharaoh Khufu (Cheops), who reigned from 2509 to 2483 BC. Despite being one of the oldest and largest monuments on Earth, there is no consensus about how it was built. To better understand its internal structure, we imaged the pyramid using muons, which are by-products of cosmic rays that are only partially absorbed by stone. The resulting cosmic-ray muon radiography allows us to visualize the known and potentially unknown voids in the pyramid in a non-invasive way. Here we report the discovery of a large void (with a cross section similar to the Grand Gallery and a length of 30 m minimum) above the Grand Gallery, which constitutes the first major inner structure found in the Great Pyramid since the 19th century. This void, named ScanPyramids Big Void, was first observed with nuclear emulsion films installed in the Queen's chamber (University of Nagoya), then confirmed with scintillator hodoscopes set up in the same chamber (KEK) and re-confirmed with gas detectors outside of the pyramid (CEA). This large void has therefore been detected with a high confidence by three different muon detection technologies and three independent analyses. These results constitute a breakthrough for the understanding of Khufu's Pyramid and its internal structure. While there is currently no information about the role of this void, these findings show how modern particle physics can shed new light on the world's archaeological heritage., Comment: Nature (2017)
- Published
- 2017
4. Impact of simulated low vision on perception and action
- Author
-
BOUMENIR, Yasmine, KADRI, Abdelmajid, SUIRE, Nadège, MURY, Corinne, KLINGER, Evelyne, Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Institut des Hauts Thébaudière, and Laval Agglomération et Conseil Général de la MayenneThis work was carried out with the financial support of Laval authorities (Laval Agglomération and Conseil Général de la Mayenne). Authors would also like to thank Dassault Systèmes for financial support (Passion for Innovation Programme), ENOZONE and EMISSIVE for development support, and all volunteers who gave their consent to carry out the experiments presented in this study.
- Subjects
[SHS.INFO]Humanities and Social Sciences/Library and information sciences ,virtual reality ,Visual impairment ,perception ,simulation ,Sciences de l'information et de la communication [Sciences de l'Homme et Société] ,behavioral assessment - Abstract
Most of us do not know how a visually impaired person perceives and acts within the environment in everyday life. In this context, an experimental study was conducted using a virtual reality simulation in which sighted people were immersed in low vision situations: blurred vision, tunnel vision, and central scotoma. After a brief familiarization procedure with a virtual reality tool called “SENSIVISE”, which includes a virtual apartment, 24 adults had to explore two rooms through low vision simulation or full vision (as a control group) to identify their location, and then were instructed to find particular targets. Perception and actions performances were measured in terms of time needed to answer questions related to visual perception, and distances between the participants’ body and the screen. The results show that low vision simulation impairs perception among sighted people. It was expressed by a statistically significant effect of lower times needed to execute tasks compared to the control condition. Consequently, the sighted individuals realized how it is difficult to perceive and move when vision is limited. Laval Agglomération et Conseil Général de la Mayenne This work was carried out with the financial support of Laval authorities (Laval Agglomération and Conseil Général de la Mayenne). Authors would also like to thank Dassault Systèmes for financial support (Passion for Innovation Programme), ENOZONE and EMISSIVE for development support, and all volunteers who gave their consent to carry out the experiments presented in this study.
- Published
- 2014
5. When sighted people are in the skin of visually impaired ones: perception and actions in virtual reality situation
- Author
-
Boumenir, Yasmine, Kadri, Abdelmajid, Suire, N., Mury, C., Klinger, Evelyne, Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Institut des Hauts Thébaudière, and Authors would like to thank Dassault Systèmes for financial support (Passion forInnovation Programme), ENOZONE and EMISSIVE for development support, and all volunteers who gave their consent to carry out the experiments presented in this study.
- Subjects
[SHS.INFO]Humanities and Social Sciences/Library and information sciences ,virtual reality ,low vision simulatio ,Sciences de l'information et de la communication [Sciences de l'Homme et Société] - Abstract
Most of us do not know how a visually impaired person perceives and acts within the environment in everyday life. In this context, an experimental study was conducted using a virtual reality simulation in which sighted people were immersed in low vision situations : Blurred vision, Tunnel vision, central Scotoma. After a brief familiarization procedure with a virtual reality tool called “SENSIVISE” which includes a virtual apartment, 24 adults had to explore two rooms through low vision simulation or full vision (as control group) to identify their location, and then were instructed to find particular targets. Perception and actions performances were measured in terms of time needed to answer questions related to visual perception, and distances between the participants’ body and the screen. The results show that low vision simulation impairs perception among sighted people. It was expressed by a statistically significant effect of lower times needed to execute tasks compared to the control condition. Consequently, the sighted individuals realized how it is difficult to perceive andmove when vision is limited. Authors would like to thank Dassault Systèmes for financial support (Passion for Innovation Programme), ENOZONE and EMISSIVE for development support, and all volunteers who gave their consent to carry out the experiments presented in this study.
- Published
- 2012
6. Precise characterization of a corridor-shaped structure in Khufu's Pyramid by observation of cosmic-ray muons.
- Author
-
Procureur S, Morishima K, Kuno M, Manabe Y, Kitagawa N, Nishio A, Gomez H, Attié D, Sakakibara A, Hikata K, Moto M, Mandjavidze I, Magnier P, Lehuraux M, Benoit T, Calvet D, Coppolani X, Kebbiri M, Mas P, Helal H, Tayoubi M, Marini B, Serikoff N, Anwar H, Steiger V, Takasaki F, Fujii H, Satoh K, Kodama H, Hayashi K, Gable P, Guerriero E, Mouret JB, Elnady T, Elshayeb Y, and Elkarmoty M
- Abstract
Khufu's Pyramid is one of the largest archaeological monument all over the world, which still holds many mysteries. In 2016 and 2017, the ScanPyramids team reported on several discoveries of previously unknown voids by cosmic-ray muon radiography that is a non-destructive technique ideal for the investigation of large-scale structures. Among these discoveries, a corridor-shaped structure has been observed behind the so-called Chevron zone on the North face, with a length of at least 5 meters. A dedicated study of this structure was thus necessary to better understand its function in relation with the enigmatic architectural role of this Chevron. Here we report on new measurements of excellent sensitivity obtained with nuclear emulsion films from Nagoya University and gaseous detectors from CEA, revealing a structure of about 9 m length with a transverse section of about 2.0 m by 2.0 m., (© 2023. The Author(s).)
- Published
- 2023
- Full Text
- View/download PDF
7. Discovery of a big void in Khufu's Pyramid by observation of cosmic-ray muons.
- Author
-
Morishima K, Kuno M, Nishio A, Kitagawa N, Manabe Y, Moto M, Takasaki F, Fujii H, Satoh K, Kodama H, Hayashi K, Odaka S, Procureur S, Attié D, Bouteille S, Calvet D, Filosa C, Magnier P, Mandjavidze I, Riallot M, Marini B, Gable P, Date Y, Sugiura M, Elshayeb Y, Elnady T, Ezzy M, Guerriero E, Steiger V, Serikoff N, Mouret JB, Charlès B, Helal H, and Tayoubi M
- Abstract
The Great Pyramid, or Khufu's Pyramid, was built on the Giza plateau in Egypt during the fourth dynasty by the pharaoh Khufu (Cheops), who reigned from 2509 bc to 2483 bc. Despite being one of the oldest and largest monuments on Earth, there is no consensus about how it was built. To understand its internal structure better, we imaged the pyramid using muons, which are by-products of cosmic rays that are only partially absorbed by stone. The resulting cosmic-ray muon radiography allows us to visualize the known and any unknown voids in the pyramid in a non-invasive way. Here we report the discovery of a large void (with a cross-section similar to that of the Grand Gallery and a minimum length of 30 metres) situated above the Grand Gallery. This constitutes the first major inner structure found in the Great Pyramid since the nineteenth century. The void, named ScanPyramids' Big Void, was first observed with nuclear emulsion films installed in the Queen's chamber, then confirmed with scintillator hodoscopes set up in the same chamber and finally re-confirmed with gas detectors outside the pyramid. This large void has therefore been detected with high confidence by three different muon detection technologies and three independent analyses. These results constitute a breakthrough for the understanding of the internal structure of Khufu's Pyramid. Although there is currently no information about the intended purpose of this void, these findings show how modern particle physics can shed new light on the world's archaeological heritage.
- Published
- 2017
- Full Text
- View/download PDF
Catalog
Books, media, physical & digital resources
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.