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Metal halide perovskite single crystal (SC) has attracted wide attentions in the field of photoelectric detection. All-inorganic perovskite SCs are much more stable than the hybrid counterparts, but its rapid fabrications usually end up low quality. We proposed a modified solvent-evaporation method that can rapidly obtain smooth and transparent high-quality CsPbBr 3 single crystal with a surface roughness of only 5 nm in a few hours. In this method, the lattice phase of the SC and the growth rate is precisely controlled by the solution temperature, which is raised to the narrow range above the cubic-to-tetragonal phase transition temperature. This precisely controlled solvent temperature allows the CsPbBr 3 SC growing immediately into cubic phase, and limits the volatilization rate of solvent, thus inhibiting the defect density. The SCs grown this way are of high crystallinity, as the half-height width of the (100) and (200) peaks of XRD rocking curve is 0.0154° and 0.0176°, respectively. Characterization of photoelectric properties shows great potential for applications in X-ray detection and photodetection. • CsPbBr 3 single crystals were grown by a modified evaporative solvent method. • The crystal quality is very high crystallinity as the half-height width of the rocking curve as low as 0.0176°. • The effect of growth temperature on crystal quality is investigated. • The growth time of large size (3 mm) CsPbBr 3 single crystals is reduced to 10 h. [ABSTRACT FROM AUTHOR]

All-inorganic CsPbX 3 quantum dots (X = Cl, Br, or I) are regarded as a new generation of efficient luminescent materials for displays and solid-state lighting due to their excellent optoelectronic properties. However, the poor stability of CsPbX 3 quantum dots severely hampers their commercial applications. Currently, the in-situ growth of CsPbX 3 quantum dots in amorphous glass has emerged as a crucial approach to significantly enhance their stability. This study successfully synthesized large-scale CsPbBr 3 @glass materials using a one-step self-crystallization method involving melting, quenching, and heat treatment. CsPbBr 3 @glass was blended with polystyrene (PS) through melt blending and extrusion, resulting in the fabrication of a CsPbBr 3 @glass@PS film. By controlling the content of quantum dot glass in polystyrene and adjusting the film's thickness, a green light film with color coordinates (0.1629, 0.7759) and a Full Width Half Maximum (FWHM) of 19.78 nm was achieved. The film produced through this process demonstrated exceptional stability, retaining 90% of its luminous intensity after 1000 h of rigorous aging experiments. Furthermore, when combined with potassium fluorosilicate composite polystyrene film and a blue light chip, a 7-inch LCD display with a color gamut of 135.8% of NTSC 1953 and 92.8% of Rec. 2020 was successfully assembled. This research holds significant reference value for the commercial application of quantum dot glass. Our paper mainly includes the following points: • For the first time, this article tried to sinter large-scale glass powder at one time, and compared the performance of quantum dot glass with different sintering scales, and its performance remained basically unchanged. • By employing a blending and extrusion process, composite plastic particles comprising quantum dot glass and polystyrene were successfully fabricated, demonstrating their suitability for rapid and efficient industrial production. • The optical properties of the film, including emission wavelength range, full width at half maximum, and color coordinates, were effectively adjusted by manipulating the film's thickness and quantum dot glass concentration. • The CsPbBr 3 @glass@PS backlight display film, prepared through the proposed methodology, exhibited sustained and excellent luminescence performance even after undergoing an extensive aging test, validating its long-term stability. • In the assembly of a 7-inch display, the resulting color gamut surpassed the NTSC1953 standard by reaching 135.8%, while achieving a remarkable coverage of the Rec.2020 color space at an impressive level of 92.8%. [ABSTRACT FROM AUTHOR]

The poor stability and low photoluminescence quantum yield (PLQY) of halide perovskite quantum dots (QDs) have been major challenges for their future practical application. Ligand engineering has been demonstrated as an effective approach for enhancing both stability and PLQY. Herein, we introduce a zwitterionic ligand, specifically N -tetradecyl- N,N -dimethyl-3-ammonio-1-propanesulfonate (TDPS), to synthesize stable CsPbBr 3 QDs by ligand post-treatment. The as-prepared TDPS-QDs exhibited an exceptional PLQY of 86.5 % and superior colloidal stability when exposed to UV light, heat, and polar solvents, owing to surface defect passivation and strong affinity to the surfaces. The PL intensity of TDPS-QDs maintains approximately 68 % (120 min) and 103 % (48 h) of its initial emission intensity under continuous irradiation or heat, respectively, whereas OA-QDs (pristine CsPbBr 3 QDs) undergo greater quenching within a shorter period. The findings highlight the potential for TDPS ligand modification to simultaneously improve the QY and stability, thus opening novel avenues for future applications involving CsPbBr 3 QDs. [Display omitted] • Zwitterionic ligand, TDPS, enables synthesis of stable CsPbBr 3 QDs with high PLQY (86.5 %). • TDPS-QDs exhibit superior stability under UV light, heat, and polar solvents. • TDPS passivates surface defects and strengthens affinity. • TDPS ligand modification opens new possibilities for CsPbBr3 QDs applications. [ABSTRACT FROM AUTHOR]

Abstract The solution-processed all-inorganic cesium lead halide perovskite material have attracted significant attention because of their high color purity, low cost, high thermal stability, high photoluminescence quantum yield. However, the low internal quantum efficiency immensely confine their application in display. In our work, we utilized an ultrathin buffer layer of the thermal activation delayed fluorescence (TADF) material 4,5-bis(carbazol-9-yl)− 1,2-dicyanobenzene (2CzPN), which can realize 100% internal quantum efficiency, to make an efficient Fӧrster energy transfer for the energy of excitons on 2CzPN to be transferred to the excited state of CsPbBr 3. A CsPbBr 3 perovskite light-emitting diode (PeLED) with an optimized ultrathin 2CzPN buffer layer exhibited improved electroluminescence (EL) performance with lower turn on voltage of 3.6 V, the maximum luminance of 7660 cd/m2, the maximum current efficiency of 2.83 cd/A, which are 7-fold and 5.5-fold compared to that of the conventional PeLED without the ultrathin buffer layer. [ABSTRACT FROM AUTHOR]

Metal halide perovskite has aroused broad interests in fabricating colorful electroluminescent devices towards solid-state lighting and display technologies. However, blue perovskite light-emitting devices (PeLEDs) still face thorny problems such as poor working stability, low efficiency, and spectral instability. Here, we exploit a synergistic regulation on the crystallization and growth of pure bromide perovskite through interface inducing and polymer spatial confinement strategy to achieve blue emission. It is found that the ethanolamine modified PEDOT:PSS could induce low-dimensional Cs 4 PbBr 6 :CsPbBr 3 composite. Polyvinyl pyrrolidone (PVP) together with poly ethylene glycol (PEG) additives inhibited its coalescence and ripening and passivated the defects simultaneously. As a consequence, dual-polymer regulated Cs 4 PbBr 6 :CsPbBr 3 PeLEDs presented an external quantum efficiency (EQE) of 3.73% and maximum brightness of 7051 cd/m2. Our facile method may provide alternative approaches to construct efficient blue PeLEDs. [Display omitted] • Blue light-emission was achieved in in-situ formed pure bromide CsPbBr 3 perovskite film under the control of polymers. • The influence of the different polymer on the optical and crystalline properties of the perovskite was investigated. • Sky blue PeLEDs was realized with luminance of 7051 cd/m2 and EQE of 3.73%. [ABSTRACT FROM AUTHOR]

Atomic layer deposition (ALD) plays a pivotal role in raising the long-term stability of perovskite quantum dot (PQD). The deposition temperature of excellent alumina film prepared by ALD is generally higher than 200 °C. In such a temperature environment, the lattice morphology of PQD is seriously damaged. In this work, to effectively protect PQD, the optimum temperature for depositing alumina on the surface of CsPbBr 3 PQD is investigated. The CsPbBr 3 PQD is deposited on a transparent glass substrate. Subsequently, an alumina layer is deposited on the surface of PQD via ALD at a deposition temperature of 40–120 °C. In our experiment, the significant degradation of PQD is observed when the deposition temperature of ALD is set to 80 °C and above. Lowering the deposition temperature can effectively improve the optical performance of PQD. The samples with alumina deposited at 75 °C show excellent stability after undergoing aging tests, and therefore 75 °C is considered the best ALD temperature. Besides, white light-emitting diode (W-LED) is produced by a method that a stack structure consisting of CsPbBr 3 coated via ALD at 75 °C and CdSe QD is excited using blue Micro-LED, and the color gamut of W-LED accounts for the wide area of 94.00% NTSC (1953) and 86.20% Rec.2020 displayed wide color gamut features. The experiment provides practical guidance for selecting the optimal deposition temperature for ALD-packaged PQD-based devices. • An optimum temperature for depositing alumina on CsPbBr 3 via ALD is investigated. • Low temperature ALD technology can effectively passivate the surface defects of CsPbBr 3. • Samples have preferable environmental stability after coating with Al 2 O 3. [ABSTRACT FROM AUTHOR]

Recently, all-inorganic CsPbX 3 (Br, I, CI) perovskites are hot and potential materials which apply to photoelectric device, due to their excellent photoelectric properties such as high carrier mobility, high fluorescence, etc. However, the poor stability greatly restricts their practical applications. In this paper, CsPbBr 3 nanocrystals (NCs) were in-situ encapsulated into PS polymer nanofibers by one step electrospinning with highly uniform size and spatial distribution. The hydrothermal stability of the obtained CsPbBr 3 @PS flexible fiber paper was radically improved with a photoluminescence quantum yield (PLQY) of 66.3%. The PL strength remained 97.2% of the initial value after immersion in water for 10 days. Their PLQY remains above 50% of its original value after heating at 80 °C for 5 h. Due to the excellent optical properties and stability of CsPbBr 3 @PS flexible fiber papers, the detection for rhodamine 6G (R6G) and rhodamine B (RhB) aqueous solution with high FRET value of 24.7% and 21.4%, respectively. Moreover, the minimum detection limit for R6G aqueous solution is 0.005 ppm. This study suggests that the CsPbBr 3 @PS flexible fiber paper is a good candidate for fabricating flexible optoelectronic devices, promising application potentials in lighting and display fields. • CsPbBr 3 NCs were in-situ encapsulated into PS polymer nanofibers by one step electrospinning which achieves high efficiency fluorescence detection of rhodamine solutions. [ABSTRACT FROM AUTHOR]

In recent years, metal halide perovskite materials have attracted great attention in the field of optoelectronics due to their excellent physical properties. However, there are still some problems restricting its practical application. In this paper, a high-quality CsPbBr 3 film with good crystalline quality, compact surface morphology and excellent optical properties was obtained by thermal evaporation preparation and annealing optimization. On this basis, p-NiO/CsPbBr 3 /n-GaN heterojunction diode was prepared. At room temperature, the diode exhibits excellent electrical and luminous properties. The I–V curve shows typical rectification behavior. The luminous mechanism has also been deeply analyzed. In addition, the temperature dependence of the electrical properties was analyzed. According to the fitting and calculation, the temperature sensitivity coefficients for forward and reverse are 2.446 × 10−4 and −7.094 × 10−6 A/°C, and the activation energy is 0.31 eV. It is found that the ambient temperature has a great influence on the luminous properties of the diode. This study demonstrates the potential application of p-NiO/CsPbBr 3 /n-GaN heterojunction diode in the field of luminescence. • Green light-emitting diode based on p-NiO/CsPbBr 3 /n-GaN heterojunction was prepared. • The high-quality CsPbBr 3 film was obtained by evaporation and annealing treatment. • The diode exhibited excellent I–V and electroluminescence characteristics. • The influence of ambient temperature on the diode was studied. [ABSTRACT FROM AUTHOR]

Inorganic perovskite quantum dots (PQDs) have been regarded as attractive materials in various optoelectronic fields due to their excellent optical properties, however, the high sensitivity to moisture, temperature and radiation has put a limit for their real long-term application, and a more stable host is indispensable. CsPbBr 3 PQDs with high stability and excellent luminescence properties are successfully embedded in tellurite-based glasses by one-step melting and subsequent heat treatment. Pure cubic structure PQDs with the radius of 2.5–5.5 nm are proved to disperse evenly in the glass matrix. Thermal and cold cycles, long-term radiation and humidity exposure have illustrated its stability and confirmed the effectiveness of the designed glass system. The high photoluminescence intensity, wide wavelength tunability of 470–508 nm and narrow band-width emission of 31.8–36.6 nm with the tunable optical band gap 2.44–2.51 eV have demonstrated its excellence as the optoelectronic materials. These results demonstrate that CsPbBr 3 PQDs embedded in tellurite glass matrix can overcome existing instability limitation and provide full potential of PQDs in practical photonic and opto-electronic applications. [Display omitted] • Cubic CsPbBr 3 PQDs are successfully precipitated in tungsten tellurite glass matrix. • Emission color is the result of band gap regulation by controlled heat treatment. • Glass rigid structure protects PQDs from the environment for long-term durability. • CsPbBr 3 PQDs exhibit impressive fluorescence after 120 days of water immersion. • PQDs embedded GNCs are promising materials for opto-electronic applications. [ABSTRACT FROM AUTHOR]

Probing the structure stability and optical properties of halide perovskites under radiation is of great significance to extend their applications in aerospace and radiation detection. However, the intrinsic radiation stability of perovskites still remains controversial due to the interferences of environmental factors such as moisture and oxygen in air. In this work, we reported CsPbBr 3 perovskite nanocrystals (CsPbBr 3 NCs) that encapsulated in amorphous glass to isolate moisture and oxygen in air, based on which the gamma-ray irradiation effect of these spatial confined CsPbBr 3 NCs was investigated in detail. The results demonstrated that CsPbBr 3 NCs display excellent structural stability accompanied with increased particle size and enhanced photoluminescence after an accumulated dose of 240 krad (Si). This improvement originates form the defect passivation on the perovskite surface under gamma-ray irradiation, which suppresses the nonradiative recombination substantially. Meanwhile, the decomposition of CsPbBr 3 NCs occurred at the dose of 360 krad (Si) and even higher, along with a deteriorated optical performance. This work provided an ideal platform to understand the intrinsic stability of halide perovskites upon radiation conditions. [Display omitted] • Spatial-confined CsPbBr 3 nanocrystals was employed to probe the intrinsic stability of the perovskites upon gamma ray irradiation. • The CsPbBr 3 displayed stable structural and photoluminescence after a gamma ray dose of 240 krad (Si), and then decomposed. [ABSTRACT FROM AUTHOR]

The instability of the cesium lead halide perovskite (CsPbX 3 , X = Cl, Br, I) upon exposure to humidity or heat strongly hinders their applications in optoelectronic devices. In this work, an in situ adsorption strategy is adopted to directly grow uniform CsPbX 3 nanocrystals (NCs) on flower-like TiO 2 microspheres to achieve a hybrid structure. Benefiting from the isolation effect of flower-like structure, the as-synthesized TiO 2 –CsPbBr 3 composites exhibit excellent water stability when soaked in water for 35 days and retain 62.7% of the initial photoluminescence (PL) emission intensity. CsPbBr 3 NCs also present enhanced thermal stability under the protection of TiO 2 matrix. It is intriguing that the TiO 2 -CsPbX 3 composites with blue, green and red emissions are fabricated successfully by this method with excellent moisture and thermal stability, which provides a feasible solution for the effective application of CsPbX 3 NCs in light emitting diode (LED) devices. • The high stability TiO 2 –CsPbBr 3 composite was synthesized by one-pot in situ adsorption approach. • The composite exhibits excellent water stability for over 35 days and enhanced thermal stability. • TiO 2 -CsPbX 3 composites with tunable PL color and stable hybrid structures were constructed. [ABSTRACT FROM AUTHOR]

CsPbX 3 (X = Cl, Br, I) perovskites have emerged as promising candidate lasing materials due to their high optical gain, low defect state density, and high absorption coefficient. Unfortunately, they suffer from poor stability, particularly with respect to temperature, moisture, and light exposure, preventing their use in practical optoelectronic applications, such as for amplified spontaneous emission (ASE) with an ultralow laser threshold. Herein, CsPbBr 3 @MCM-41 molecular sieve (CMM) composites are controllably prepared by different ultrasonication and stirring treatments. In addition, different perovskite concentrations and heat-treatment conditions are also considered to demonstrate the ASE behaviors. In addition, CMM@PS (CMMP) and CMM@AB (CMMA) composites were fabricated successfully by further optimizing the mixing ratio of CMM and the polymer. More excitingly, the stability of the CMM@polymer films with respect to the external environment is greatly improved after the polymer coating. To our surprise, the CMM@ploymer thin films demonstrated ASE at room-temperature, with an ASE threshold as low as 0.136 mJ/cm2 and 0.049 mJ/cm2 for CMMA and CMMP, respectively. These results clearly shed light upon the control and optimization of CsPbBr 3 perovskite composite films, paving the way for their widespread use in optoelectronic applications. • The composite films were prepared by one-step spin coating. • The as-prepared film can effectively avoid the instabilities to water and thermal. • SE of the films can be realized by optimizing the pretreatment conditions. • The threshold of ASE can be as low as 0.136 mJ/cm2. [ABSTRACT FROM AUTHOR]

CsPbBr 3 nanoplatelets (NPLs) have been considered as a promising candidate in the field of blue-emitting because of large exciton binding energies, thickness-tunable emission and excellent charge-transfer properties. In this paper, the effect of ligand concentration, solvent polarity, and ligand hydrocarbon chain on the photoluminescence (PL) and morphology properties of NPLs were studied. The PL properties of the NPLs depended strongly on the thickness which was controlled by ligands. The thickness of NPLs increased with increasing the amount of oleylamine. In contrast, the addition amount of oleic acid did not affect the PL properties of the NPLs. In addition, the thickness of NPLs becomes thinner with shortening carbon chain. Furthermore, the polarity of solvent (n -hexane instead of toluene) played an important role in the thickness of NPLs. The higher polarity of toluene induces the preparation of thicker NPLs. These results contribute to the further study of the formation mechanism of perovskite NPLs and promote the application of NPLs in the field of optoelectronic devices. • CsPbBr 3 nanoplatelets (NPLs) were prepared to get tunable and stable photoluminescence (PL). • The PL of the NPLS depended on ligand concentration, solvent polarity, and ligand hydrocarbon chain. • The thickness of NPLs became thinner obviously with shortening carbon chain and thicker using high polarity toluene. • The PL of the NPLs depended strongly on the thickness which was controlled by ligands. [ABSTRACT FROM AUTHOR]

Perovskite light-emitting diodes (PeLEDs) as the next-generation display have been attracting wide attention due to high color purity, high photoluminescence quantum-yields (PLQYs), and easily tunable bandgap. Perovskite film quality has been being a fatal factor influencing electroluminescence (EL) performance of PeLEDs. The big pinholes and high roughness in the pristine CsPbBr 3 perovskite film cause severely leakage current. In addition, the low PLQY indicates that the perovskite film retains poor radiative recombination. These may lead to a limited EL performance for PeLEDs. Therefore, in this work, to obtain an perovskite film with full coverage surface and desirable optical property, the long ligand 2-phenylethanamine bromide (PEABr) was introduced into CsPbBr 3 perovskite solution firstly. After the introduction of PEABr, the photoluminescence (PL) intensity and perovskite morphology quality have been improved. Meanwhile, the exiton quantum confinement is enhanced by the layerd structure in the PEA 2 Cs n-1 Pb n Br 3n+1 perovskite film. Secondly, an organic molecule, named benzyltriphenylphosphonium chloride (BTPPC), was further introduced into the perovskite precursor solution to enhance crystallization process to obtain a better perovskite film with less pinholes and smaller grains. Finally, the PeLEDs with two additives achieved the best external quantum efficiency (EQE) of 11.9%, which is 45.7-fold to that of the pristine device. And the stability of the PeLEDs can be improved from 240 s to 2079 s under an initial luminance of 1000. cd / m 2. [Display omitted] • With the introduction of PEABr, the quasi-2D perovskite was formed. • The better film morphology was obtained and the radiative recombination was enhanced with the help of PEABr and BTPPC. • The external quantum efficiency was improved by 45.7-fold and the stability was enhanced from 249 s to 2079 s. [ABSTRACT FROM AUTHOR]

CsPbBr 3 nanocrystals-glass composite scintillators based on Ce3+-doped borosilicate glass were prepared by melt-quenching method with further heat-treatment. Incorporating Ce3+ into borosilicate glasses matrix, highly enhanced green emission was observed under 365 nm ultraviolet and X-ray excitation. The transmittance of the prepared CsPbBr 3 nanocrystals-glass is as high as 80% at 527 nm, fluorescence lifetime is 21.6 ns, and the luminescent quantum efficiency reaches up to 28% after thermal treatment (550 °C, 12 h). Compared with undoped CsPbBr 3 nanocrystals-glass, the X-ray excited luminescence intensity of Ce3+ doped CsPbBr 3 nanocrystals-glass is around 190%, which indicates that the issue of absorbing ray energy in glass matrix can be effectively solved by incorporation of Ce3+ ions. • CsPbBr 3 :Ce3+-doped glass ceramic was prepared and characterized. • The transmittance of the prepared samples is as high as 80% (at 527 nm). • The quantum efficiency of Ce3+ doped samples are reaches up to 28%. • PL and XEL intensities of Ce3+ doped GC are enhanced by 1.4 and 1.9 times compared to that of undoped GC. [ABSTRACT FROM AUTHOR]

This study reports a seeding-layer free synthesis of nanostructured three-dimensional zinc oxide (3D-ZnO) thin films via a simple and cost-effective chemical bath deposition method (CBD) followed by their sensitization with inorganic perovskite halide semiconductors for luminescence-based applications. The emission abilities of pristine ZnO nanostructures have been enhanced with the incorporation of CsPbBr 3 in the cubic crystal phase, which is proven to be a highly stable member of the inorganic halide perovskite family. Additionally, the transformation of CsPbBr 3 nanocrystals into Cs 4 PbBr 6 –CsPbBr 3 composite structure has been attained by altering the (i) CsBr content and (ii) crystallization temperature during the perovskite synthesis step, resulting in a remarkable luminescence increase for the overall structure by ~17 folds. A detailed evaluation of defect contents and carrier lifetimes of pristine and perovskite deposited ZnO thin films have been conducted via time-resolved photoluminescence spectroscopy showing an improved electron transfer especially for Cs 4 PbBr 6 –CsPbBr 3 deposited ZnO thin films. • 3D-ZnO nanostructures were deposited via facial CBD method. • The transformation of CsPbBr 3 nanocrystals into Cs 4 PbBr 6 –CsPbBr 3 composite structure was attained. • Cs 4 PbBr 6 –CsPbBr 3 sensitized ZnO thin films resulted in a PL enhancement by almost 17 folds. • A significant extension in carrier lifetimes of perovskite sensitized 3D-ZnO nanostructures. [ABSTRACT FROM AUTHOR]

The effect of thickness of cesium lead halide perovskite CsPbBr 3 nanoplatelets (NPLs) on their electronic structure and optical properties are investigated using an effective-mass envelope function theory based on the 8-band k·p model with the consideration of exciton binding energy. We first reported the CsPbBr 3 nanoplatelets' band structure and optical gain with exciton effect. As the thickness of NPLs decreases, their bandgap increases and the band mixing is more obvious which influences the transition matrix element (TME). The optical gain of CsPbBr 3 nanoplatelets is calculated by taking into account of TME, Fermi factor, injected carrier density and thickness. A blue shift of peak position in optical gain can be observed as the thickness of NPLs decreases. As the injected carrier density arises, the maximum optical gain of thicker NPLs reach saturation much faster than the thinner ones. To obtain high differential gain, NPLs with less thickness are better choices. Experimental work is carried out and the results agree with our theoretical results very well. • We first reported the CsPbBr3 nanoplatelets' band structure and optical gain with exciton effect. • The effect of thickness on energy band and optical properties of perovskite CsPbBr 3 NPLs is revealed with the help of the 8-band k.p model. • The maximum optical gain of thinner NPLs need higher carrier density to reach saturation, which means a higher differential gain can be obtained. • The exciton enhanced optical gain spectrum are obtained. [ABSTRACT FROM AUTHOR]

A new strategy for optical thermometer with high sensitivity was developed herein by employing exciton recombination of CsPbBr 3 quantum dots as temperature detecting signal and 4f→4f transition Eu3+ ions as reference one. A series of structural and spectroscopic characterizations confirmed that CsPbBr 3 perovskite quantum dots were successfully precipitated and Eu3+ doping activators remained in glass matrix. Benefited from their completely different thermal-quenching behaviors, fluorescence intensity ratio of exciton recombination and Eu3+ emission in nanocomposite exhibited excellent temperature sensing property in the temperature ranging from 93 K to 383 K. The maximum absolute and relative temperature sensitivity can reach as high as 0.0224 K-1 and 2.25% K−1, respectively. We believe that this work will exploit an effective pathway for developing innovative non-contact optical thermometric materials. • CsPbBr 3 quantum dots and Eu3+ dopants co-doped glasses were prepared. • CsPbBr 3 quantum dots were precipitated and Eu3+ activators remained in glass matrix. • Exciton recombination and Eu3+ 4f-4f luminescence can be simultaneously detected. • Highly temperature-sensitive Eu3+/CsPbBr 3 fluorescence intensity ratio was achieved. • The investigated nanocomposites may find promising application in optical thermometry. [ABSTRACT FROM AUTHOR]

Herein, CsPbBr 3 quantum dots (QDs) were successfully synthesized via the supersaturated recrystallization (SR) method by using para-xylene as the anti-solvent. The as-prepared CsPbBr 3 QDs exhibited high quantum efficiency (78%) and narrow luminescent peaks with a full width at half maximum of around 21.2 nm. Compared with the commonly-used anti-solvents, para-xylene shows low toxic effect and high freezing point (13.3 °C). Therefore, CsPbBr 3 QDs can be easily preserved in the refrigerator like an ice-cream for further use. The maximum photoluminescence (PL) emission intensity would reach 90% retention after 60 days' storage in the refrigerator. By using this simple method, the stability of CsPbBr 3 QDs has been effectively improved for long-term storage and further application. Image 1 • Low toxic para-xylene is used as the anti-solvent for synthesizing CsPbBr 3 QDs. • The as-prepared CsPbBr 3 QDs exhibit bright green luminescence (QY of 78%), and narrow luminescent peaks. • CsPbBr 3 QDs could be frozen in the refrigerator and keep stable in para-xylene. [ABSTRACT FROM AUTHOR]