Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 13, Issue 2, Pages 718-725Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c03895
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Funding
- Major Research Project of Xiamen [3502Z20191015]
- Fujian Provincial Natural Science Foundation of China [2020J01297]
- Research Project of Mindu Innovation Laboratory [2021ZZ114]
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A new strategy combining precursor and surface engineering has been developed to achieve improved red-light emission stability and suppression of halide segregation in mixed-halide perovskite nanocrystals.
Halide segregation is a critical bottleneck that hampers the application of mixed-halide perovskite nanocrystals (NCs) in both electroluminescent and down-conversion red-light-emitting diodes. Herein, we report a strategy that combines precursor and surface engineering to obtain pure-red-emitting (peaked at 624 nm) NCs with a photoluminescence quantum yield of up to 92% and strongly suppresses the halide segregation of mixed-halide NCs under light irradiation. Red-light-emitting diodes (LED) using these mixed-halide NCs as phosphors exhibit color-stable emission with a negligible peak shift and spectral broadening during operation over 240 min. By contrast, a dramatic peak shift and spectral broadening were observed after 10 min of operation in LEDs based on mixed-halide NCs synthesized by a traditional method. Our strategy is critical to achieving photo- and band-gap-stable mixed-halide perovskite NCs for a variety of optoelectronic applications such as micro-LEDs.
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