A novel D-π-A blue fluorophore based on [1,2,4]triazolo[1,5-a]pyridine as electron acceptor and its application in organic light-emitting diodes

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

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Author(s)

  • Jia-Xiong Chen
  • Zhong-Yi Wang
  • Xu-Hui Zheng
  • Chong-Wei Ding
  • Jing-Hong Li
  • Jie-Ji Zhu
  • Qing-Xiao Tong

Detail(s)

Original languageEnglish
Pages (from-to)1071-1079
Journal / PublicationMaterials Chemistry Frontiers
Volume3
Issue number6
Online published30 Mar 2019
Publication statusPublished - 1 Jun 2019

Abstract

[1,2,4]triazolo[1,5-a]pyridine (TP) is employed as a novel electron acceptor to construct a deep-blue bipolar fluorescent emitter (TPP-PPI) for the first time. Single crystals of TPP-PPI show a special packing mode which may provide a carrier transport channel. TPP-PPI has a high photoluminescence quantum yield of 97.5% in neat film. Non-doped organic light emitting diodes (OLEDs) with the new compound as emitter exhibits a high-performance deep-blue emission with an external quantum efficiency (EQE) of 6.05% and CIE coordinates of (0.15, 0.11) at 1000 cd m-2. The doped devices based on TPP-PPI shows comparable performances and better deep-blue color purities. A 20 wt% TPP-PPI based OLED displays an EQEmax of 6.34% and a color index of (0.15, 0.06), satisfying European Broadcasting Union blue color standard. Furthermore, the high triplet energy (2.33 eV) allows TPP-PPI to be used as a host for PO-01 phosphor to realize high performance range phosphorescent OLED (EQEmax = 24.7%).

Citation Format(s)

A novel D-π-A blue fluorophore based on [1,2,4]triazolo[1,5-a]pyridine as electron acceptor and its application in organic light-emitting diodes. / Cao, Chen; Chen, Wen-Cheng; Tian, Shuang et al.
In: Materials Chemistry Frontiers, Vol. 3, No. 6, 01.06.2019, p. 1071-1079.

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