Issue 55, 2020, Issue in Progress
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RSC Advances

Modulation for efficiency and spectra of non-doped white organic light emitting diodes by combining an exciplex with an ultrathin phosphorescent emitter

Zemei Liu,a   Bo Zhao, ORCID logo *a   Yuan Gao,*b   Haifeng Chen,c   Bizheng Dong,a   Yabo Xu,a   Hua Wang, ORCID logo *a   Bingshe Xua  and  Wenlian Lid  

* Corresponding authors

a Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
E-mail: zhaobo01@tyut.edu.cn, wanghua001@tyut.edu.cn

b College of Economics and Management, Chongqing University of Arts and Sciences, Chongqing 402160, China
E-mail: yuangao@cqwu.edu.cn

c School of Electronic Information and Electrical Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, China

d State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China

Abstract

Herein, structured non-doped white organic light-emitting diodes (WOLEDs) were designed by combining the emission of a blue exciplex and orange-red phosphorescent ultrathin layer. The device efficiency and spectra were modulated successfully by adjusting the thickness of the exciplex layer and ultrathin layer, respectively. Meanwhile, high efficiency with external quantum efficiency (EQE) ranging from 15% to 22%, power efficiency from 33 lm W−1 to 47 lm W−1 and warm white emission with correlated color temperature (CCT) from 1600 K to 2600 K were realized. The energy transfer process and emission mechanism is also discussed, and the results reveal that the efficient charge trapping and recombination contribute to the improvement of device efficiency and reduce the roll-off efficiency.

Graphical abstract: Modulation for efficiency and spectra of non-doped white organic light emitting diodes by combining an exciplex with an ultrathin phosphorescent emitter

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Article information

DOI
https://doi.org/10.1039/D0RA06658C
Article type
Paper
Submitted
01 Aug 2020
Accepted
26 Aug 2020
First published
10 Sep 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 33461-33468

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Modulation for efficiency and spectra of non-doped white organic light emitting diodes by combining an exciplex with an ultrathin phosphorescent emitter

Z. Liu, B. Zhao, Y. Gao, H. Chen, B. Dong, Y. Xu, H. Wang, B. Xu and W. Li, RSC Adv., 2020, 10, 33461 DOI: 10.1039/D0RA06658C

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