Charge Balance in Red QLEDs for High Efficiency and Stability via Ionic Liquid Doping

Yunfei Li; Xi Fan; Cai ShenXixiu ShiPengcheng LiKwun Nam HuiJunpeng FanKai KangTing ZhangLei Qian

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Charge Balance in Red QLEDs for High Efficiency and Stability via Ionic Liquid Doping

机译：Charge Balance in Red QLEDs for High Efficiency and Stability via Ionic Liquid Doping

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Colloidal quantum dot light-emitting diodes (QLEDs) simultaneously exhibiting high external quantum efficiency (EQE) and operation stability are achieved via a simple solution processing. A silver bis(trifluoromethanesulfonyl) imide treatment that is used to chemically dope the poly(3,4- ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) hole injection layer (HIL) is proposed. The ionic liquid salt acts as an effective p-dopant for high charge concentrations; and it raises the work functions and surface potentials of the PEDOT:PSS HIL for an interface energy band alignment. Benefiting from a raised hole mobility and a better charge mobility balance, the processing-simple colloidal red QLEDs yielded the highest EQE of up to 17.4%. In particular, a very broad plateau of EQE values over 16.5% in the brightness of 400–10 000 cd m~(?2) is obtained. Moreover, the packaged QLEDs exhibit an excellent operation stability in ambient air. The T_(95) (time for the device brightness to decrease to 95% of its initial brightness) at an initial brightness of 1000 cd m~(?2) is 4160 h. The work highlights a promising ionic liquid strategy to guide the development of high-performance and costeffective QLEDs.

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来源
《Advanced functional materials》 |2022年第32期|2203641.1-2203641.11|共11页
作者
Yunfei Li; Xi Fan; Cai ShenXixiu ShiPengcheng LiKwun Nam HuiJunpeng FanKai KangTing ZhangLei Qian;
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Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Avenida da Universidade Taipa, Macau SAR 999078, China;

Division of Functional Materials and Nanodevices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201, China,Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices Ningb;

Division of Functional Materials and Nanodevices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201, ChinaHubei Key Laboratory of Plasma Chemistry and Advanced Materials Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials School of Materials Science and Engineering Wuhan Institute of Technology Wuhan 430205, China;

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正文语种英语
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dopants; ionic liquids; light emitting diodes; PEDOT:PSS; quantum dots;

Charge Balance in Red QLEDs for High Efficiency and Stability via Ionic Liquid Doping

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