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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

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

Detail(s)

Original languageEnglish
Article number263302
Journal / PublicationApplied Physics Letters
Volume115
Issue number26
Online published26 Dec 2019
Publication statusPublished - Dec 2019

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.

Citation Format(s)

High efficiency, high color rendering index white organic light-emitting diodes based on thermally activated delayed fluorescence materials. / Li, Zhiyi; Li, Bowen; Wei, Xiaofang; Liu, Jianjun; Wang, Ruifang; Hu, Xiaoxiao; Liu, Guanhao; Gao, Honglei; Zhang, Yong; Lee, Chun-Sing; Wang, Pengfei; Wang, Ying.

In: Applied Physics Letters, Vol. 115, No. 26, 263302, 12.2019.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal