钙钛矿(结构)
卤化物
发光二极管
荧光粉
光致发光
溴化物
发光
量子产额
水溶液
材料科学
无机化学
化学
光电子学
化学工程
荧光
光学
结晶学
物理化学
物理
工程类
作者
Kai-Kai Liu,Qian Liu,Dongwen Yang,Ya‐Chuan Liang,Laizhi Sui,Jianyong Wei,Guo-Wei Xue,Wenbo Zhao,Xueying Wu,Lin Dong,Kai-Kai Liu
标识
DOI:10.1038/s41377-020-0283-2
摘要
Poor stability has long been one of the key issues that hinder the practical applications of lead-based halide perovskites. In this paper, the photoluminescence (PL) quantum yield (QY) of bromide-based perovskites can be increased from 2.5% to 71.54% by introducing water, and the PL QY of a sample in aqueous solution decreases minimally over 1 year. The enhanced stability and PL QY can be attributed to the water-induced methylamino lead bromide perovskite (MAPbBr3)@PbBr(OH). We note that this strategy is universal to MAPbBr3, formamidine lead bromide perovskite (FAPbBr3), inorganic lead bromide perovskite (CsPbBr3), etc. Light-emitting devices (LEDs) are fabricated by using the as-prepared perovskite as phosphors on a 365 nm UV chip. The luminance intensity of the LED is 9549 cd/m2 when the driven current is 200 mA, and blemishes on the surface of glass are clearly observed under the illumination of the LEDs. This work provides a new strategy for highly stable and efficient perovskites.
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