表面配体修饰的溴化铯铅纳米晶以提高发光性能。
Surface ligand modification of cesium lead bromide nanocrystals for improved light-emitting performance.
机构信息
State Key Laboratory on Integrated Optoelectronics, and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
出版信息
Nanoscale. 2018 Mar 1;10(9):4173-4178. doi: 10.1039/c7nr09126e.
Abstract
Cesium lead halide perovskite nanocrystals (NCs) possess excellent optical properties at visible wavelengths with great promise for applications in luminous display fields. We demonstrate a method to modify the surface ligand passivation of perovskite NCs for enhanced colloidal stability and emitting properties by incorporating didodecyl dimethyl ammonium bromide (DDAB). The photoluminescence quantum yield of the NC solution was improved to 96% from 70% and the perovskite film showed fewer trapped sites and enhanced carrier transport ability. The thus fabricated electroluminescent perovskite NC-LEDs exhibited a bright luminance of 11 990 cd m, corresponding to 4-times improved external quantum efficiency (EQE), compared to the control device using regular NCs without DDAB.
摘要
铯铅卤钙钛矿纳米晶体 (NCs) 在可见光波长下具有优异的光学性能，有望在发光显示领域得到应用。我们展示了一种通过引入双十二烷基二甲基溴化铵 (DDAB) 来修饰钙钛矿 NCs 的表面配体钝化的方法，以提高胶体稳定性和发光性能。NC 溶液的光致发光量子产率从 70%提高到 96%，钙钛矿薄膜显示出更少的陷光位和增强的载流子输运能力。因此制备的电致发光钙钛矿 NC-LED 表现出 11990 cd m 的高亮度，与不使用 DDAB 的常规 NCs 的对照器件相比，外量子效率 (EQE) 提高了 4 倍。
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