Reducing the impact of Auger recombination in quasi-2D perovskite light-emitting diodes

被引:368
作者
Jiang, Yuanzhi [1 ]
Cui, Minghuan [2 ]
Li, Saisai [1 ]
Sun, Changjiu [1 ]
Huang, Yanmin [1 ]
Wei, Junli [1 ]
Zhang, Li [1 ]
Lv, Mei [1 ]
Qin, Chaochao [2 ]
Liu, Yufang [2 ]
Yuan, Mingjian [1 ]
机构
[1] Nankai Univ, Coll Chem, Key Lab Adv Energy Mat Chem, Minist Educ,Renewable Energy Convers & Storage Ct, Tianjin 300071, Peoples R China
[2] Henan Normal Univ, Coll Phys & Mat Sci, Henan Key Lab Infrared Mat & Spectrum Measures &, Xinxiang 453007, Henan, Peoples R China
基金
中国国家自然科学基金;
关键词
OPTICAL-PROPERTIES; DIELECTRIC CONFINEMENT; QUANTUM DOTS; EFFICIENT;
D O I
10.1038/s41467-020-20555-9
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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 (Eb). Thus, Auger recombination can be suppressed by reducing the corresponding materials' Eb. Here, a polar molecule, p-fluorophenethylammonium, is employed to generate quasi-2D perovskites with reduced Eb. 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.
引用
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页数:10
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