光致发光
钙钛矿(结构)
成核
量子产额
纳米晶
材料科学
奥斯特瓦尔德成熟
发光二极管
化学工程
化学
光电子学
纳米技术
结晶学
光学
有机化学
工程类
荧光
物理
作者
Sheng Sun,Min Lu,Po Lu,Xin Li,Fujun Zhang,Zhennan Wu,Tianshuang Wang,Fengping Yan,Ting Li,Tingting Feng,Yu Zhang,Xue Bai
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-04-26
标识
DOI:10.1021/acs.nanolett.4c01099
摘要
Perovskite light-emitting diodes (PeLEDs) based on CsPb(Br/I)3 nanocrystals (NCs) usually suffer from severe spectral instability under operating voltage due to the poor-quality PeNCs. Herein, zeolite was utilized to prepare high-quality CsPb(Br/I)3 NCs via promoting the homogeneous nucleation and growth and suppressing the Ostwald ripening of PeNCs. In addition, the decomposed zeolite interacted strongly with PeNCs through Pb–O bonds and hydrogen bonds, which inhibited the formation of defects and suppressed halide ion migration, leading to an improved photoluminescence quantum yield (PLQY) and enhanced stability of PeNCs. Moreover, the strong binding affinity of decomposed zeolite to PeNCs contributed to the formation of homogeneous perovskite films with high PLQY. As a result, pure-red PeLEDs with Commission International de I'Eclairage (CIE) coordinates of (0.705, 0.291) were fabricated, approaching the Rec. 2020 red primary color. The devices achieved a peak external quantum efficiency of 23.0% and outstanding spectral stability.
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