俄歇效应
重组
螺旋钻
钝化
量子效率
光致发光
钙钛矿(结构)
二极管
激子
材料科学
发光二极管
光电子学
重组率
原子物理学
物理
化学
纳米技术
凝聚态物理
结晶学
基因
生物化学
图层(电子)
作者
Yuanzhi Jiang,Minghuan Cui,Saisai Li,Changjiu Sun,Yanmin Huang,Keyu Wei,Li Zhang,Mei Lv,Chaochao Qin,Yufang Liu,Mingjian Yuan
标识
DOI:10.1038/s41467-020-20555-9
摘要
Abstract Rapid Auger recombination represents an important challenge faced by quasi-2D perovskites, which induces resulting perovskite light-emitting diodes’ (PeLEDs) efficiency roll-off. In principle, Auger recombination rate is proportional to materials’ exciton binding energy ( E b ). Thus, Auger recombination can be suppressed by reducing the corresponding materials’ E b . Here, a polar molecule, p -fluorophenethylammonium, is employed to generate quasi-2D perovskites with reduced E b . Recombination kinetics reveal the Auger recombination rate does decrease to one-order-of magnitude lower compared to its PEA + analogues. After effective passivation, nonradiative recombination is greatly suppressed, which enables resulting films to exhibit outstanding photoluminescence quantum yields in a broad range of excitation density. We herein demonstrate the very efficient PeLEDs with a peak external quantum efficiency of 20.36%. More importantly, devices exhibit a record luminance of 82,480 cd m −2 due to the suppressed efficiency roll-off, which represent one of the brightest visible PeLEDs yet.
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