Approaching Efficient and Narrow RGB Electroluminescence from D—A-Type TADF Emitters Containing an Identical Multiple Resonance Backbone as the Acceptor

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

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Author(s)

  • Feng Huang
  • Kai Wang
  • Yi-Zhong Shi
  • Xiao-Chun Fan
  • Xiang Zhang
  • Jia Yu
  • Xiao-Hong Zhang

Detail(s)

Original languageEnglish
Pages (from-to)36089-36097
Journal / PublicationACS Applied Materials and Interfaces
Volume13
Issue number30
Online published21 Jul 2021
Publication statusPublished - 4 Aug 2021

Abstract

Highly twisted electron donor (D)-electron acceptor (A)-type thermally activated delayed fluorescence (TADF) emitters can achieve high efficiency while suffering from serious structural relaxations and broad emissions. Multiple resonance (MR)-type TADF emitters can realize narrow emission. However, until now, only a few efficient MR-emitting cores are reported and custom tunning of their emission color remains a major challenge in their wider applications. In this work, by combining the conventional TADF and MR-TADF designs, we demonstrate that color tuning and narrowing the spectral width of conventional TADF emission can be easily achieved simultaneously. We select a prototypical carbonyl (C═O)/N-based MR core as a backbone and attach it with D segments of different electron-donating abilities and numbers to obtain three different TADF emitters with emissions from sky blue to green and orange-red while maintaining the narrow emission of the original MR core. The corresponding sky blue, green, and orange-red organic light-emitting diodes achieve maximum external quantum efficiencies of 20.3, 27.3, and 26.3%, respectively, and narrow full widths at half-maximum all below 0.28 eV. These results provide a new molecular design strategy for developing narrowband TADF emitters with easily tunable emissions covering the full visible range.

Research Area(s)

  • D—A-type compound, full visible emission range, high color purity, multiple resonance backbone, organic light-emitting diodes, thermally activated delayed fluorescence

Citation Format(s)

Approaching Efficient and Narrow RGB Electroluminescence from D—A-Type TADF Emitters Containing an Identical Multiple Resonance Backbone as the Acceptor. / Huang, Feng; Wang, Kai; Shi, Yi-Zhong; Fan, Xiao-Chun; Zhang, Xiang; Yu, Jia; Lee, Chun-Sing; Zhang, Xiao-Hong.

In: ACS Applied Materials and Interfaces, Vol. 13, No. 30, 04.08.2021, p. 36089-36097.

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