光致发光
钙钛矿(结构)
纳米晶
材料科学
三元运算
相(物质)
量子产额
卤化物
发光
化学工程
纳米技术
结晶学
光电子学
化学
无机化学
光学
有机化学
荧光
程序设计语言
工程类
物理
计算机科学
作者
Sangyeon Cho,Seok Hyun Yun
标识
DOI:10.1038/s42004-020-0265-6
摘要
Cesium lead halide perovskite (CsPbX3, X=Cl, Br, I) nanocrystals embedded in Cs4PbX6 or CsPb2X5 matrices have received interests due to their excellent optical properties. However, their precise endotaxial structures are not known, and the origin of photoluminescence remains controversial. Here we report a sonochemistry technique that allowed us to synthesize high-quality CsPbBr3-based microcrystals in all ternary phases, simply by adjusting precursor concentrations in a polar aprotic solvent, N,N-dimethylformamide. The microcrystals with diverse morphologies enabled us to visualize the lattice alignments in the dual-phase composites and confirm CsPbBr3 nanocrystals being the photoluminescent sites. We demonstrate high solid-state quantum yield of >40% in Cs4PbBr6/CsPbBr3 and lasing of CsPbBr3 microcrystals as small as 2 µm in size. Real-time optical analysis of the reaction solutions provides insights into the formation and phase transformation of different CsPbBr3-based microcrystals.
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