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New Quinoxaline-Based Blue Emitters: Molecular Structures, Aggregation-Induced Enhanced Emission Characteristics and OLED Application

Mao, Xiaoyu; Xie, Fuli; Wang, Xiaohui; Wang, Qingsong; Qiu, Zhipeng; Elsegood, Mark R. J.; Bai, Jie; Feng, Xing; Redshaw, Carl; Huo, Yanping; Hu, Jian?Yong; Chen, Qing

Authors

Xiaoyu Mao

Fuli Xie

Xiaohui Wang

Qingsong Wang

Zhipeng Qiu

Mark R. J. Elsegood

Jie Bai

Xing Feng

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Professor Carl Redshaw C.Redshaw@hull.ac.uk
Professor of Inorganic Materials Chemistry and REF Lead for Chemistry

Yanping Huo

Jian?Yong Hu

Qing Chen



Abstract

Three new deep blue light emitters, bearing quinoxaline with different substituents (biphenyl/pyrene) at the 1- or 2-position, were synthesized by a Pd-catalysed coupling reaction in high yields, and were fully characterized by 1H/13C NMR spectroscopy, single crystal X-ray diffraction, and high-resolution mass spectrometry (HRMS). The designed molecules exhibit good thermal stability (Tg > 452 oC). Single crystal X-ray diffraction indicated the compounds containing pyrene units exhibiting π-π stacking, and thus this family of compounds exhibited intramolecular charge transfer (ICT) and non-typical and aggregation-induced enhanced emission (AIEE) characteristics, possessing blue emission both in solution and in the aggregation (solid) state. Furthermore, a selected deep blue emitter was utilized as the emitting layer for the fabrication of doped organic light-emitting diode (OLED) devices, which afforded a deep blue electroluminescence (EL) peak at 428 nm with a narrow full width at half maximum (FWHM) of 57 nm, and the Commission Internationale de L'Eclairage (CIE) chromaticity coordinates of (0.15, 0.06).

Citation

Mao, X., Xie, F., Wang, X., Wang, Q., Qiu, Z., Elsegood, M. R. J., …Chen, Q. (in press). New Quinoxaline-Based Blue Emitters: Molecular Structures, Aggregation-Induced Enhanced Emission Characteristics and OLED Application. Chinese Journal of Chemistry, https://doi.org/10.1002/cjoc.202100157

Journal Article Type Article
Acceptance Date Apr 27, 2021
Online Publication Date Apr 29, 2021
Deposit Date May 10, 2021
Publicly Available Date Apr 30, 2022
Journal Chinese Journal of Chemistry
Print ISSN 1001-604X
Electronic ISSN 1614-7065
Publisher Shanghai Institute of Organic Chemistry
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1002/cjoc.202100157
Keywords Quinoxaline; Pyrene; Blue emitter; Aggregation‐induced emission; Organic light‐emitting diode
Public URL https://hull-repository.worktribe.com/output/3767553

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©2021 The authors. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder






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