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Stability of Hybrid Organic-Inorganic Perovskite CH3NH3PbBr3 Nanocrystals under Co-Stresses of UV Light Illumination and Temperature

1
Fujian Engineering Research Center for Solid-State Lighting, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Department of Electronic Science, Xiamen University, Xiamen 361005, China
2
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
3
School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
4
College of Energy, Xiamen University, Xiamen 361102, China
5
State Key Laboratory for the Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(8), 1158; https://doi.org/10.3390/nano9081158
Received: 19 July 2019 / Revised: 7 August 2019 / Accepted: 9 August 2019 / Published: 13 August 2019
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Abstract

Hybrid organic–inorganic metal halide perovskite nanocrystals (NCs) are among the candidates for color conversion materials in displays, especially in NC-based micro-light-emitting diode (micro-LED) displays. However, these NCs are still lacking long-term stability, which has hindered their large-scale applications. We mimic the working conditions, which include ultraviolet light illumination at 323 K and three different types of atmosphere (N2, vacuum, and air), respectively, to investigate the stability of CH3NH3PbBr3 NCs embedded in the polyvinylidene fluoride matrix. X-ray diffraction results indicate the generation of NH4Pb2Br5, which is produced from the encapsulated CH3NH3PbBr3 NCs in all three atmospheres, and the decomposition generates a large amount of accompanying interface defects at the surface area of NCs, resulting in the significant decrease of the photoluminescence (PL) intensity. This work highlights the stability-related mechanism of CH3NH3PbBr3 NCs under combined external stresses that mimic operating conditions. In addition, this work also suggests a new method for conducting aging tests and contributes to developing effective routes towards higher stability of perovskite NCs. View Full-Text
Keywords: perovskite nanocrystals; stability; combined stresses; electronic structure; photophysical properties perovskite nanocrystals; stability; combined stresses; electronic structure; photophysical properties
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Guo, W.; Chen, N.; Xu, B.; Lu, Y.; Li, B.; Wu, T.; Cheng, Q.; Li, Y.; Chen, J.; Lin, Y.; Chen, Z. Stability of Hybrid Organic-Inorganic Perovskite CH3NH3PbBr3 Nanocrystals under Co-Stresses of UV Light Illumination and Temperature. Nanomaterials 2019, 9, 1158.

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