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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.