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- Title
Charge Balance in Red QLEDs for High Efficiency and Stability via Ionic Liquid Doping.
- Authors
Li, Yunfei; Fan, Xi; Shen, Cai; Shi, Xixiu; Li, Pengcheng; Hui, Kwun Nam; Fan, Junpeng; Kang, Kai; Zhang, Ting; Qian, Lei
- Abstract
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(trifluoromethane‐sulfonyl)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 T95 (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 cost‐effective QLEDs.
- Subjects
IONIC liquids; QUANTUM dot LEDs; SEMICONDUCTOR nanocrystals; HOLE mobility; QUANTUM efficiency
- Publication
Advanced Functional Materials, 2022, Vol 32, Issue 32, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202203641