钙钛矿(结构)
发光二极管
卤化物
材料科学
二极管
相(物质)
光电子学
实现(概率)
钝化
碘化物
有机发光二极管
化学
纳米技术
无机化学
结晶学
统计
数学
有机化学
图层(电子)
作者
Shaowei Liu,Hongmei Zhan,Chuanli Qin,Chuanjiang Qin
标识
DOI:10.1021/acs.jpclett.2c03457
摘要
Quasi-two-dimensional (quasi-2D) perovskites are promising for the realization of spectrally stable pure red perovskite light-emitting diodes (PeLEDs) with a single iodide component, because they avoid the halide separation that red three-dimensional perovskites of mixed halides have faced. However, the distribution of high-order phases in solution-processed quasi-2D perovskite films causes the spectral shift away from the pure red region. Here, we introduced a simple approach of adding excessive ligand combinations to redistribute the phase distribution of quasi-2D perovskite and to inhibit the high-order phase. Appropriate excess organic ligands will not affect charge injection but will keep the efficient energy funneling and passivate the defect. The narrowed phase distribution reduced the band tail state and restrained reverse charge transfer, resulting in enhanced radiation recombination. We obtained efficient and spectrally stable pure red PeLEDs at 638 nm (approaching the Rec. 2020 specification) with a peak EQE of 11.8% and maximum luminance of 1688 cd/cm2. This study provides guidance for future developments of highly efficient pure red PeLEDs.
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