Enhanced Thermal Stability of Halide Perovskite CsPbX<sub>3</sub> Nanocrystals by a Facile TPU Encapsulation

Shi, Jindou; Ge, Wanyin; Gao, Wenxing; Xu, Meimei; Zhu, Jianfeng; Li, Yongxiang

doi:10.1002/adom.201901516

Cited by 60 publications

(42 citation statements)

References 68 publications

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“…In addition to the enhanced optical properties, the durability of CsPbBr 3 NCs was significantly improved by the introduction of Cs 4 PbBr 6 , one such feature being their thermal stability. [189][190][191][192] In a heating and cooling cycle, the PL intensity of pristine CsPbBr 3 and CsPbBr 3 /Cs 4 PbBr 6 composite was quenched as the temperature increased. During the cooling procedure, the quenching was gradually recovered, but never recovers to the original state.…”

Section: Nanosized Compositementioning

confidence: 99%

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

et al. 2020

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resistance against thermal-treatment compared to organic-inorganic hybrid lead halide perovskites (MAPbX 3 and FAPbX 3), due to the high thermal decomposition temperature of inorganic cations, thus drawing much attention. Owing to their impressive features, all-inorganic lead halide perovskites have been greatly useful in photovoltaic and optoelectronic applications, including solar cells, light-emitting diodes (LEDs), lasers, photodetectors and photocatalysis. [5-17] The conspicuous achievements in CsPbX 3 provoke the rapid development of its derivatives, Cs 4 PbX 6 and CsPb 2 X 5. These Cs x Pb y X z materials are composed of the same element compositions and [PbX 6 ] 4− unit cells. However, they possess completely different connectivity characters of [PbX 6 ] 4− octahedrons. CsPbX 3 is classified as a type of 3D perovskite, because [PbX 6 ] 4− octahedra are corner-shared along all three axes, while CsPb 2 X 5 has a sandwich-like arrangement with Cs + cations in between PbX 2 crystallographic planes, which can be regarded as a 2D phase. In Cs 4 PbX 6 , disconnected [PbBr 6 ] 4− octahedra are completely decoupled by Cs + cations. Among these three structures, CsPb 2 X 5 and Cs 4 PbX 6 , with dimensional-network less than 3 are referred to as lowdimensional-networked cesium lead halide perovskites. Besides the connectivity, these structures can be understood from a confinement perspective. CsPbX 3 is not confined in any dimension such that it can be considered as a 3D networked semiconductor. CsPb 2 X 5 and Cs 4 PbX 6 are confined in one dimension and all three dimensions, hence the name 2D and 0D structures, respectively. [18,19] In CsPb 2 X 5 and Cs 4 PbX 6 , the excitons cannot dissociate easily within all dimensions; instead, they are confined in the PbX 2 planes and individual [PbX 6 ] 4− units, respectively, resulting in larger bandgaps compared to the traditional ABX 3 phase. Figure 1 illustrates these three structures with different dimensions. Until now, comprehensive accounts of these Cs x Pb y X z materials have been made. However, most recent research focuses on CsPbX 3 , which has excellent optical properties and promising potential in various applications. Its derivatives, CsPb 2 X 5 and Cs 4 PbX 6 have achieved tremendous progress but are still far behind that of CsPbX 3. Many problems still seriously limit the rapid development of these low-dimensional-networked perovskites, a typical one being the debate on the origin of their luminescence. In this Review article, we focus on Cs 4 PbX 6 and CsPb 2 X 5 , and attempt to unveil their features, potential in All-inorganic cesium lead halide perovskites have emerged as promising optoelectronic materials with excellent photophysical properties and great potential in a variety of applications. In parallel with the most investigated CsPbX 3 , its derivates, Cs 4 PbX 6 and CsPb 2 X 5 , with low-dimensional-networked structures have also attracted great attention. In this review, recent advancements on the low-dimensional-networked cesium lead halide perovs...

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Section: Nanosized Compositementioning

confidence: 99%

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

et al. 2020

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“…Recently, IPeNCs have been composited with polymers to enhance their stability against moisture, light, and heat. Compared with other techniques, blending IPeNCs with a commercial polymer, such as polymethylmethacrylate, poly(laurylmethacrylate), polydimethylsiloxane, polystyrene, poly(styrene-ethylene-butylene-styrene), and thermoplastic polyurethane, is a relatively easy and effective method for protecting IPeNCs [21][22][23][24][25][26][27]. However, during the time-consuming blending process in air, IPeNCs often decompose and agglomerate owing to the large difference in the polarity between the IPeNCs and polymers.…”

Section: Introductionmentioning

confidence: 99%

Wavelength-Tunable and Water-Stable Cesium–Lead-Based All-Bromide Nanocrystal–Polymer Composite Films Using Ultraviolet-Curable Prepolymer as an Anti-Solvent

et al. 2022

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All-inorganic metal halide perovskite nanocrystals (IPeNCs) have become one of the most promising luminescent materials for next-generation display and lighting technology owing to their excellent color expression ability. However, research on IPeNCs with stable blue emission is limited. In this paper, we report stable blue emissive all-bromide IPeNCs obtained through a modified ligand-assisted reprecipitation method using an ultraviolet (UV)-curable prepolymer as the anti-solvent at a low temperature. We found that the blue emission originates from quantum-confined CsPbBr3 nanoparticles formed together with the colorless wide-bandgap Cs4PbBr6 nanocrystals. When the temperature of the prepolymer was increased from 0 to 50 °C, CsPbBr3 nanoparticles became larger and more crystalline, thereby altering their emission color from blue to green. The synthesized all-bromide blue-emitting IPeNC solution remained stable for over 1 h. It also remained stable when it was mixed with the green-emitting IPeNC solution. By simply exposing the as-synthesized IPeNC–prepolymer solutions to UV light, we formed water-stable composite films that emitted red, green, blue, and white colors. We believe that this synthetic method can be used to develop color-emitting composite materials that are highly suitable for application as the color conversion films of full-color liquid crystal display backlight systems and lighting applications.

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“…To further demonstrate the outstanding thermal stability of the SCP@MSNs‐PDMS film, the comparisons of the PL retention and cycle number after heating–cooling cycle of SCP@MSNs‐PDMS film with some latest reported results were shown in Figure 3j. [ 26,33–40 ] It can be observed that even being tested at the highest testing temperature and longest heating–cooling cycles, SCP@MSNs‐PDMS film represented by the asterisk presented the best room temperature PL retention compared with the results reported in the literature, which further proved the ultra‐excellent thermal stability of SCP@MSNs‐PDMS film.…”

Section: Resultsmentioning

confidence: 57%

“…To further demonstrate the outstanding thermal stability of the SCP@MSNs-PDMS film, the comparisons of the PL retention and cycle number after heating-cooling cycle of SCP@MSNs-PDMS film with some latest reported results were shown in Figure 3j. [26,[33][34][35][36][37][38][39][40] It can be observed that even being tested at the highest testing temperature and longest heating-cooling cycles, SCP@MSNs-PDMS film represented by the asterisk presented Small 2022, 18, 2107452 The emission wavelengths of g) CsPbBr 3 QDs, h) SCP-PDMS film, and i) SCP@MSNs-PDMS film after heating-cooling cycle tests at different temperatures (60, 100, 150, 200 °C). j) The comparisons of the PL retention and cycle number after heating-cooling cycle of our results with some latest reported results.…”

Section: Resultsmentioning

confidence: 99%

Ultra‐Thermostability of Spatially Confined and Fully Protected Perovskite Nanocrystals by In Situ Crystallization

Qin-Yi

Shen

Luo

et al. 2022

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Although all‐inorganic perovskite materials present multiple fascinating optical properties, their poor stability undermines their potential application in the field of multi‐color display. Herein, spatially confined CsPbBr3 nanocrystals are in situ crystallized within uniform mesoporous SiO2 nanospheres (MSNs) to regulate their size distribution, passivate their surface defects, shield them from water/oxygen, and more importantly, enhance their thermotolerance. As a result, the remnant PL intensity of the prepared spatially confined perovskite (CsPbBr3) nanocrystals by in situ crystallization within uniform mesoporous SiO2 nanospheres (SCP@MSNs) powders can be maintained over 98% of its initial value even after being immersed in harsh conditions (0.1 m HCl or 0.1 m NaOH) for 60 days. Furthermore, the prepared SCP@MSNs‐PDMS film demonstrates astonishing thermostability by maintaining almost consistent room temperature PL intensities after continuous heating–cooling cycles between 200 and 25 °C, which would greatly improve its processability during potential industrial manufacturing. The fabricated LCD backlit based on SCP@MSNs covers 124% of NTSC standard and 95.6% of Rec. 2020 standard, indicating its great potential in practical display field.

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Enhanced Thermal Stability of Halide Perovskite CsPbX₃ Nanocrystals by a Facile TPU Encapsulation

Cited by 60 publications

References 68 publications

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

Wavelength-Tunable and Water-Stable Cesium–Lead-Based All-Bromide Nanocrystal–Polymer Composite Films Using Ultraviolet-Curable Prepolymer as an Anti-Solvent

Ultra‐Thermostability of Spatially Confined and Fully Protected Perovskite Nanocrystals by In Situ Crystallization

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Enhanced Thermal Stability of Halide Perovskite CsPbX3 Nanocrystals by a Facile TPU Encapsulation

Cited by 60 publications

References 68 publications

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

Wavelength-Tunable and Water-Stable Cesium–Lead-Based All-Bromide Nanocrystal–Polymer Composite Films Using Ultraviolet-Curable Prepolymer as an Anti-Solvent

Ultra‐Thermostability of Spatially Confined and Fully Protected Perovskite Nanocrystals by In Situ Crystallization

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Enhanced Thermal Stability of Halide Perovskite CsPbX₃ Nanocrystals by a Facile TPU Encapsulation