材料科学
卤化物
钙钛矿(结构)
甲脒
纳米晶
发光二极管
光致发光
纳米技术
结晶度
水分
量子产额
光电子学
二极管
化学工程
无机化学
复合材料
光学
化学
工程类
物理
荧光
作者
Harshita Bhatia,Cristina Martín,Masoumeh Keshavarz,Iurii Dovgaliuk,Nadine Schrenker,Martin Ottesen,Weiming Qiu,Eduard Fron,Martin Bremholm,J. Van de Vondel,Sara Bals,Maarten B. J. Roeffaers,Johan Hofkens,Elke Debroye
标识
DOI:10.1021/acsami.2c20605
摘要
Lead halide perovskites are promising candidates for high-performance light-emitting diodes (LEDs); however, their applicability is limited by their structural instability toward moisture. Although a deliberate addition of water to the precursor solution has recently been shown to improve the crystallinity and optical properties of perovskites, the corresponding thin films still do not exhibit a near-unity quantum yield. Herein, we report that the direct addition of a minute amount of water to post-treated formamidinium lead bromide (FAPbBr3) nanocrystals (NCs) substantially enhances the stability while achieving a 95% photoluminescence quantum yield in a NC thin film. We unveil the mechanism of how moisture assists in the formation of an additional NH4Br component. Alongside, we demonstrate the crucial role of moisture in assisting localized etching of the perovskite crystal, facilitating the partial incorporation of NH4+, which is key for improved performance under ambient conditions. Finally, as a proof-of-concept, the application of post-treated and water-treated perovskites is tested in LEDs, with the latter exhibiting a superior performance, offering opportunities toward commercial application in moisture-stable optoelectronics.
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