量子点
量子效率
发光二极管
光电子学
材料科学
二极管
锆
表面改性
钙钛矿(结构)
物理化学
化学
结晶学
冶金
作者
Min Lu,Jie Guo,Siqi Sun,Po Lu,Jinlei Wu,Yu Wang,Stephen V. Kershaw,William W. Yu,Andrey L. Rogach,Yù Zhang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2020-03-30
卷期号:20 (4): 2829-2836
被引量:142
标识
DOI:10.1021/acs.nanolett.0c00545
摘要
Zirconium acetylacetonate used as a co-precursor in the synthesis of CsPbI3 quantum dots (QDs) increased their photoluminescence quantum efficiency to values over 90%. The top-emitting device structure on a Si substrate with high thermal conductivity (to better dissipate Joule heat generated at high current density) was designed to improve the light extraction efficiency making use of a strong microcavity resonance between the bottom and top electrodes. As a result of these improvements, light-emitting diodes (LEDs) utilizing Zr-modified CsPbI3 QDs with an electroluminescence at 686 nm showed external quantum efficiency (EQE) of 13.7% at a current density of 108 mA cm-2, which was combined with low efficiency roll-off (maintaining an EQE of 12.5% at a high current density of 500 mA cm-2) and a high luminance of 14 725 cd m-2, and the stability of the devices being repeatedly lit (cycled on and off at high drive current density) has been greatly enhanced.
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