Thermally Activated Delayed Fluorescence Warm White Organic Light Emitting Devices with External Quantum Efficiencies Over 30%

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

3 Scopus Citations
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Author(s)

  • Jia-Xiong Chen
  • Kai Wang
  • Hui Wang
  • Xiao-Chun Fan
  • Jia Yu
  • Feng-Xia Geng
  • Xiao-Hong Zhang

Detail(s)

Original languageEnglish
Article number2101647
Journal / PublicationAdvanced Functional Materials
Volume31
Issue number31
Online published31 May 2021
Publication statusPublished - Aug 2021

Abstract

While monochrome organic light-emitting diodes (OLEDs) based on thermally activated delayed fluorescence (TADF) emitters have achieved over 30% external quantum efficiencies (EQEs), all-TADF white OLEDs (WOLEDs) are still lagging behind. Herein, a simple system based on two color-complementary TADF emitters is exploited to realize high-performance WOLEDs. By doping a high-performance orange–red TADF fluorophor (BPPZ-DPXZ) into a blue TADF host (DBFCz-Trz), energy transfer, and triplet-to-singlet conversion in the host-dopant system can be optimized to simultaneously achieve full exciton utilization and color balance. With this design, all-TADF single-emitting-layer WOLEDs with a maximum EQE up to 32.8% are demonstrated. This high efficiency surpasses EQEs of reported WOLEDs based on both TADF as well as phosphorescence. It is expected that this finding can provide new insight for designing highly efficient all-TADF WOLEDs.

Research Area(s)

  • energy transfer, single emitting-layer, thermally activated delayed fluorescence, white organic light-emitting diodes

Citation Format(s)

Thermally Activated Delayed Fluorescence Warm White Organic Light Emitting Devices with External Quantum Efficiencies Over 30%. / Chen, Jia-Xiong; Wang, Kai; Xiao, Ya-Fang; Cao, Chen; Tan, Ji-Hua; Wang, Hui; Fan, Xiao-Chun; Yu, Jia; Geng, Feng-Xia; Zhang, Xiao-Hong; Lee, Chun-Sing.

In: Advanced Functional Materials, Vol. 31, No. 31, 2101647, 08.2021.

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