Industrial-Scale Fabrication of Mixed-Halide Perovskite Quantum Dots with High Comprehensive Performances for
Hanyan Huang1,2, Jianwu Zhou3, Qiuting Cai1,2
1School of Materials Science and Engineering, State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou 310027, P. R. China.
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The large-scale fabrication of mixed-halide perovskite quantum dots (QDs) with concurrently enhanced optical performances and stability remains a bottleneck for both fundamental science and industrial deployment. Herein, we demonstrate an industrial-scale synthesis of CsPbBr1.5I1.5 QDs encapsulated in a silica molecular sieve (MS) through a modified high-temperature solid-state strategy. Our study reveals that the higher chemical reactivity of cesium carbonate/lead halide precursors, compared to traditional cesium halide/lead halide, inhibits halide segregation in obtained CsPbBr1.5I1.5/MS composites and consequently boosts their optical performance (full width at half maxima of 29.2 ± 0.7 nm and photoluminescence quantum yield of 86.2 ± 2.2%). Comprehensive stability assessments confirm the robust durability of these CsPbBr1.5I1.5/MS composites against humidity, heating, light irradiation, and even mechanical stresses. Further, we demonstrate red-emitting modules based on these CsPbBr1.5I1.5/MS composites via polymer-compatible processing techniques, exhibiting potential applications in flexible wearable devices, wide color-gamut displays, and underwater illuminations.
