High efficiency, high color rendering index white organic light-emitting diodes based on thermally activated delayed fluorescence materials

Zhiyi Li; Bowen Li; Xiaofang Wei; Jianjun Liu; Ruifang Wang; Xiaoxiao Hu; Guanhao Liu; Honglei Gao; Yong Zhang; Chun-Sing Lee; Pengfei Wang; Ying Wang

doi:10.1063/1.5139481

Author(s)

Zhiyi Li
Bowen Li
Xiaofang Wei
Jianjun Liu
Ruifang Wang
Xiaoxiao Hu
Guanhao Liu
Honglei Gao
Yong Zhang
Pengfei Wang
Ying Wang

Related Research Unit(s)

Centre of Super-Diamond and Advanced Films

Detail(s)

Original language	English
Article number	263302
Journal / Publication	Applied Physics Letters
Volume	115
Issue number	26
Online published	26 Dec 2019
Publication status	Published - Dec 2019

Link(s)

DOI	DOI https://doi.org/10.1063/1.5139481 Final Published version
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Attachment(s)	Documents 44890508.pdf Final Published version, 1.94 MB, PDF Publisher's Copyright Statement This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Zhiyi Li, Bowen Li, Xiaofang Wei, Jianjun Liu, Ruifang Wang, Xiaoxiao Hu, Guanhao Liu, Honglei Gao, Yong Zhang, Chun-Sing Lee, Pengfei Wang, and Ying Wang , "High efficiency, high color rendering index white organic light-emitting diodes based on thermally activated delayed fluorescence materials", Appl. Phys. Lett. 115, 263302 (2019) and may be found at https://doi.org/10.1063/1.5139481.
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85077514518&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(bf616996-90e7-4c13-8c39-6847dffc396b).html

Abstract

High efficiency white organic light-emitting diodes (WOLEDs) with simple device architecture are desirable for next-generation light sources. However, it is still challenging in the construction of high-performance WOLEDs with a simple device structure. Based on a thermally activated delayed fluorescence (TADF) blue emitter 2SPAc-MPM and a TADF yellow emitter TXO-TPA, high performance two-color WOLEDs with simple device architecture are demonstrated. Benefiting from efficient energy transfer and wide coverage over the visible spectrum, optimized WOLED devices that have a single emitting layer (s-EML) provide a maximum color rendering index (CRI) and maximum external quantum efficiency (EQE) of 78.1 and 21.8%, respectively. More importantly, with multiple emitting layers (m-EMLs), a maximum EQE of 14.5% and a high CRI of 90.7 can be achieved. These results are among the best for the two-color WOLEDs with two TADF emitters.