电致发光
发光二极管
材料科学
卤化物
钙钛矿(结构)
纳米晶
光电子学
发光
二极管
离子
蓝移
量子效率
光致发光
无机化学
纳米技术
结晶学
化学
有机化学
图层(电子)
作者
Long Gao,Tuo Cheng,Lijie Gou,Yilin Zhang,Yuping Liu,Long Yuan,Xiaoyu Zhang,Yinghui Wang,Fanxu Meng,Jiaqi Zhang
标识
DOI:10.1021/acsami.3c02437
摘要
Blue light-emittin g diodes (LEDs) are important components for perovskite electroluminescence applications, which still suffer from insufficient luminescence efficiency and poor stability. In Cl/Br mixed perovskite NCs, surficial defects cause severe light failure and ion migration, the in-depth mechanism of which is also not clear. To gain insights into these issues, we employ the ligand post-addition approach for mixed Cl/Br NCs by using octylammonium hydrobromide (OctBr) ligands, which effectively decrease surficial light loss and block ion migration pathways. The passivated CsPbCl1.5Br1.5 NCs exhibit exceptional blue emission with 95% PLQY, and the electroluminescence spectra of LEDs are located at the initial positions at the initial states. The treated NC blue devices show a negligible color shift as the voltage increases, which proves that electric-field-driven ion migration is drastically suppressed. In addition, OctBr-treated CsPbCl1.5Br1.5 and CsPbClBr2 NC LEDs show high external quantum efficiencies of 2.42 and 3.05% for emission peaks at 456 and 480 nm, respectively. Our work identified the nature of NC surface defects and provided a surficial modification approach to develop high-performance and color-stable blue mixed-halide perovskite LEDs.
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