Molecular Conformational Isomerization : An Efficient Way to Design Novel Emitters with Dual-Thermally Activated Delayed Fluorescence Characteristics and Their Optoelectronic and Bioimaging Applications

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

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Author(s)

  • Yi-Zhong Shi
  • Hao Wu
  • Shao-Li Zhang
  • Xiao-Chun Fan
  • Ye Tian
  • Chang-Qing Ye
  • Kai Wang
  • Jia Yu
  • Xiao-Hong Zhang

Detail(s)

Original languageEnglish
Journal / PublicationCCS Chemistry
Online published22 Jul 2023
Publication statusOnline published - 22 Jul 2023

Abstract

Single-molecule luminophores with dual-thermally activated delayed fluorescence (TADF) properties are receiving increasing attention. However, how to achieve these goals requires more in-depth studies. Herein, we demonstrate a novel example emitter, 10-(5-(2-(pyridin-3-yl)-[4,5 & PRIME;-bipyrimidin]-6-yl)pyridin-2-yl)-10H-phenoxazine (PmPy-PXZ), enabling dual-TADF properties due to its key feature of conformational isomeri-zation. Introducing a pyridine bridge can greatly reduce the steric hindrance and facilitate dual-stable conformations in the ground state, where the quasi-axial (QA) forms predominate. Moreover, unlike previ-ously reported TADF molecules with dual confirmations, both theoretical and experimental measurements show that not only the quasi-equatorial (QE) forms but also the QA forms exhibit distinct TADF character-istics, which can be attributed to an additional higher reverse intersystem crossing pathway. This is the first time that dual-TADF properties of single molecules have been achieved based on conformational isomerism. Its applications in "self-doping" organic light-emitting diode and biomedical imaging have further been investigated. All these results show the good potential of such dual-band TADF emitters based on molecular conformational isomerization. © 2023 Chinese Chemical Society

Research Area(s)

  • dual-thermally activated delayed fluorescence, conformational isomerization, organic light-emit-ting diode, biomedical imaging, self-doping

Citation Format(s)

Molecular Conformational Isomerization: An Efficient Way to Design Novel Emitters with Dual-Thermally Activated Delayed Fluorescence Characteristics and Their Optoelectronic and Bioimaging Applications. / Shi, Yi-Zhong; Xiao, Ya-Fang; Wu, Hao et al.
In: CCS Chemistry, 22.07.2023.

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