Double-twist pyridine-carbonitrile derivatives yielding excellent thermally activated delayed fluorescence emitters for high-performance OLEDs

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

3 Scopus Citations
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Author(s)

  • Jiafang Li
  • He Liu
  • Zhanxiang Chen
  • Danyang Chai
  • Chuluo Yang

Detail(s)

Original languageEnglish
Pages (from-to)602-606
Journal / PublicationJournal of Materials Chemistry C
Volume8
Issue number2
Online published18 Nov 2019
Publication statusPublished - 14 Jan 2020

Abstract

Possessing high photoluminescence quantum yield (PLQY) and fast reverse intersystem crossing (RISC) process are critical for obtaining efficient thermally activated delayed fluorescence (TADF) emitters. Herein, two donor-spacer-acceptor molecules, namely, 4-(4-(9,9-dimethylacridin-10(9H)-yl)phenyl)-2,6-dimethylpyridine-3,5-dicarbonitrile (Me-DMAC) and 4-(4-(10H-phenoxazin-10-yl)phenyl)-2,6-dimethylpyridine-3,5-dicarbonitrile (Me-PXZ), were developed via a double-twist design strategy. The large hindrance induces a twisted geometry, leading to small ΔEST values and fast RISC processes. The time-resolved photophysical measurements revealed the TADF emissions of these pyridine-3,5-dicarbonitrile-based molecules in doped thin films. High external quantum efficiency (EQE) values of 25.8% and 21.1% were achieved in organic light-emitting diodes (OLEDs) using green Me-DMAC and yellow Me-PXZ dyes, respectively, as emitters.

Citation Format(s)

Double-twist pyridine-carbonitrile derivatives yielding excellent thermally activated delayed fluorescence emitters for high-performance OLEDs. / Li, Jiafang; Chen, Wen-Cheng; Liu, He; Chen, Zhanxiang; Chai, Danyang; Lee, Chun-Sing; Yang, Chuluo.

In: Journal of Materials Chemistry C, Vol. 8, No. 2, 14.01.2020, p. 602-606.

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