期刊
NANOMATERIALS
卷 9, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/nano9081158
关键词
perovskite nanocrystals; stability; combined stresses; electronic structure; photophysical properties
类别
资金
- National Natural Science Foundation of China [61504112, 11604285, 51605404, 11504182, 11674054]
- Fundamental Research Funds for the Central Universities [20720190005]
- Science and Technology Project of Fujian Province [2018H6022]
- Natural Science Foundation of Fujian Province [2018J01103]
- Technological Innovation Project of Economic and Information Commission of Fujian Province
- Strait Postdoctoral Foundation of Fujian Province
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 (N-2, 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.
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