Efficient Thermally Activated Delayed Fluorescence from All‐Inorganic Cesium Zirconium Halide Perovskite Nanocrystals
作者:Siping Liu、Bin Yang、Junsheng Chen、Donghui Wei、Daoyuan Zheng、Qingkun Kong、Weiqiao Deng、Keli Han
DOI:10.1002/anie.202009101
日期:2020.12
Thermally activated delayed fluorescence (TADF) is generally observed in solid‐state organic molecules or metal‐organic complexes. However, TADF in all‐inorganic colloidal nanocrystals (NCs) is rare. Herein, we report the first colloidal synthesis of an air‐stable all‐inorganic lead‐free Cs2ZrCl6 perovskite NCs. The Cs2ZrCl6 NCs exhibit long‐lived triplet excited state (138.2 μs), and feature high
通常在固态有机分子或金属有机络合物中观察到热激活延迟荧光(TADF)。但是,全无机胶体纳米晶体(NCs)中的TADF很少。在此,我们报道了一种空气稳定的全无机无铅Cs 2 ZrCl 6钙钛矿NC的胶体合成。Cs 2 ZrCl 6 NCs表现出长寿命的三重态激发态(138.2μs),并且由于TADF机制而具有高的光致发光(PL)量子效率(QY = 60.37%)。合成卤化物Cs 2 ZrBr x Cl 6− x(0≤x≤1.5)NCs。飞秒瞬态吸收和温度相关的PL测量被执行以阐明发射机理。此外,Bi 3+离子已成功掺杂到Cs 2 ZrCl 6 NCs中,这进一步扩展了PL性能。这项工作不仅为潜在的光电应用开发了一种新型的无铅卤化物钙钛矿型NC,而且还为开发新型的无机磷光体提供了独特的策略。