A Highly Twisted Carbazole-Fused DABNA Derivative as an Orange-Red TADF Emitter for OLEDs with Nearly 40 % EQE

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Ying-Chun Cheng
  • Xiao-Chun Fan
  • Feng Huang
  • Xin Xiong
  • Jia Yu
  • Kai Wang
  • Xiao-Hong Zhang

Detail(s)

Original languageEnglish
Article numbere202212575
Journal / PublicationAngewandte Chemie - International Edition
Volume61
Issue number47
Online published27 Sept 2022
Publication statusPublished - 21 Nov 2022

Link(s)

Abstract

Multiple resonance (MR) type thermally activated delayed fluorescence (TADF) material is currently a research hotspot in organic light-emitting diodes (OLEDs) due to their high color purity and high exciton utilization. However, there are only a handful of MR-TADF emitters with emissions beyond the blue-to-green region. The very limited emission colors for MR-TADF emitters are mainly caused by the fact that so far molecular modifications of MR-TADF do not offer much change in the emission colors. Here, we report a new approach to modifying a prototypical MR core of DABNA by fusing carbazoles to the MR framework. The carbazole-fused molecule (TCZ-F-DABNA) basically maintains the MR-dominated features of DABNA while red-shifting the emission. Its OLED achieves an external quantum efficiency of 39.2 % with a peak at 588 nm, which is a record-high efficiency for OLEDs with peaks beyond 560 nm. This work provides a new approach for significantly tunning emission colors of MR-TADF emitters.

Research Area(s)

  • Carbazole Fusion, Concentration Quenching, Multiple Resonance, Organic Light-Emitting Diodes, Thermally Activated Delayed Fluorescence

Citation Format(s)

A Highly Twisted Carbazole-Fused DABNA Derivative as an Orange-Red TADF Emitter for OLEDs with Nearly 40 % EQE. / Cheng, Ying-Chun; Fan, Xiao-Chun; Huang, Feng et al.
In: Angewandte Chemie - International Edition, Vol. 61, No. 47, e202212575, 21.11.2022.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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