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

Weijie Guo; Nan Chen; Binbin Xu; Yijun Lu; Bin Li; Tingzhu Wu; Qijin Cheng; Yang Li; Jin Chen; Yue Lin; Zhong Chen

doi:10.3390/nano9081158

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

Nanomaterials (Basel). 2019 Aug 13;9(8):1158. doi: 10.3390/nano9081158.

Authors

Weijie Guo¹, Nan Chen¹, Binbin Xu², Yijun Lu¹, Bin Li³, Tingzhu Wu¹, Qijin Cheng¹, Yang Li⁴, Jin Chen⁴, Yue Lin⁵, Zhong Chen^{6

7}

Affiliations

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 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. yue.lin@xmu.edu.cn.
⁶ 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. chenz@xmu.edu.cn.
⁷ State Key Laboratory for the Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China. chenz@xmu.edu.cn.

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.

Keywords: combined stresses; electronic structure; perovskite nanocrystals; photophysical properties; stability.

Abstract

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