甲脒
材料科学
发光二极管
钙钛矿(结构)
掺杂剂
光电子学
纳米晶
量子效率
兴奋剂
电致发光
二极管
三极管
化学物理
量子点
纳米技术
化学
结晶学
图层(电子)
作者
Young Hoon Kim,Sungjin Kim,Arvin Kakekhani,Jin-Woo Park,Jaehyeok Park,Yong Hee Lee,Hengxing Xu,Satyawan Nagane,Robert B. Wexler,Dong Hyeok Kim,Seung Hyeon Jo,Laura Martínez‐Sarti,Peng Tan,Aditya Sadhanala,Gyeong Su Park,Young Woon Kim,Bin Hu,Henk J. Bolink,Seunghyup Yoo,Richard H. Friend,Andrew M. Rappe,Tae Woo Lee
出处
期刊:Nature Photonics
[Springer Nature]
日期:2021-01-04
卷期号:15 (2): 148-155
被引量:601
标识
DOI:10.1038/s41566-020-00732-4
摘要
Electroluminescence efficiencies of metal halide perovskite nanocrystals (PNCs) are limited by a lack of material strategies that can both suppress the formation of defects and enhance the charge carrier confinement. Here we report a one-dopant alloying strategy that generates smaller, monodisperse colloidal particles (confining electrons and holes, and boosting radiative recombination) with fewer surface defects (reducing non-radiative recombination). Doping of guanidinium into formamidinium lead bromide PNCs yields limited bulk solubility while creating an entropy-stabilized phase in the PNCs and leading to smaller PNCs with more carrier confinement. The extra guanidinium segregates to the surface and stabilizes the undercoordinated sites. Furthermore, a surface-stabilizing 1,3,5-tris(bromomethyl)-2,4,6-triethylbenzene was applied as a bromide vacancy healing agent. The result is highly efficient PNC-based light-emitting diodes that have current efficiency of 108 cd A−1 (external quantum efficiency of 23.4%), which rises to 205 cd A−1 (external quantum efficiency of 45.5%) with a hemispherical lens. Guanidinium doping is shown to enhance the operation of perovskite nanocrystal light-emitting diodes.
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