Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
Publication date: 28th August 2024
In this study, we developed a method for synthesizing stable and uniform high-performance perovskite nanocrystals by recovering surface defects using an excess halide for CsPbBr3/ZnS core/shell structured nanocrystals. By employing N-bromosuccinimide as a halide donor, surface halide vacancies of bare CsPbBr3 perovskite nanocrystals were successfully recovered during the growth of a ZnS shell, as confirmed by density functional theory calculations. This approach not only achieves a high photoluminescence quantum yield of nearly 1, but also significantly improves the stability of perovskite nanocrystals under adverse conditions such as high humidity and elevated temperatures. Furthermore, the CsPbBr3/ZnS perovskite nanocrystal based light-emitting diodes demonstrated outstanding performance, achieving a remarkable external quantum efficiency of 12.77% and a maximum luminance of 1449 cd m−2 at 517 nm. These improvements pave the way for their use in various applications. These substantial improvements in both efficiency and stability highlight the potential of this approach for advancing the application of perovskite nanocrystals in next-generation optoelectronic devices, such as displays, lighting, and other high-performance applications.
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