钝化
发光二极管
钙钛矿(结构)
光电子学
材料科学
二极管
量子效率
共发射极
氧化物
化学
纳米技术
图层(电子)
结晶学
冶金
作者
Mingliang Li,Yaping Zhao,Xiangqian Qin,Qingshan Ma,Jianxun Lu,Kebin Lin,Peng Xu,Yuqing Li,Wengjing Feng,Wen‐Hua Zhang,Zhanhua Wei
出处
期刊:Nano Letters
[American Chemical Society]
日期:2022-03-09
卷期号:22 (6): 2490-2496
被引量:82
标识
DOI:10.1021/acs.nanolett.2c00276
摘要
Recently, surface passivation has been proved to be an essential approach for obtaining efficient and stable perovskite light-emitting diodes (Pero-LEDs). Phosphine oxides performed well as passivators in many reports. However, the most commonly used phosphine oxides are insulators, which may inhibit carrier transport between the perovskite emitter and charge-transporter layers, limiting the corresponding device performance. Here, 2,7-bis(diphenylphosphoryl)-9,9'-spirobifluorene (SPPO13), a conductive molecule with two phosphine oxide functional groups, is introduced to modify the perovskite emitting layer. The bifunctional SPPO13 can passivate the nonradiative defects of perovskite and promote electron injection at the interface of perovskite emitter and electron-transporter layers. As a result, the corresponding Pero-LEDs obtain a maximum external quantum efficiency (EQE) of 22.3%. In addition, the Pero-LEDs achieve extremely high brightness with a maximum of around 190 000 cd/m2.
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