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New quinoxaline-based blue emitters: molecular structures, aggregation-induced enhanced emission characteristics and OLED application

journal contribution
posted on 29.04.2021, 14:30 by Xiaoyu Mao, Fuli Xie, Xiaohui Wang, Qingsong Wang, Zhipeng Qiu, Mark ElsegoodMark Elsegood, Jie Bai, Xing Feng, Carl Redshaw, Yanping Huo, Jian‐Yong Hu, Qing Chen
Three new, deep blue light emitters, containing quinoxaline with differing substitution positions (1‐ or 2‐ position) pyrene (biphenyl) moieties, were synthesized by a Pd‐catalysed coupling reaction in high yield, and were fully characterized by 1H/13C NMR spectroscopy, single crystal X‐ray diffraction, and high‐resolution mass spectrometry (HRMS). The designed molecules exhibited good thermal stability (Tg > 452 oC). Single crystal X‐ray diffraction indicated that 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 fabricating of doped OLED devices, which afforded a deep blue electroluminescence (EL) peak at 428 nm with a narrow FWHM of 57 nm, and the Commission Internationale de L'Eclairage (CIE) chromaticity coordinates of (0.15, 0.06).

Funding

National Natural Science Foundation of China (21975054 and 21602014)

Natural Science Foundation of Guangdong Province of China (2019A1515010925)

Guangdong Provincial Key Laboratory of Information Photonics Technology 2020B121201011

“One Hundred Talents Program” of the Guangdong University of Technology (GDUT) (1108-220413205

Guangdong provincial key laboratory of functional soft condensed matter of the Guangdong University of Technology (GDUT) (220413205)

Coordination chemistry approaches to societal issues: environment and health

Engineering and Physical Sciences Research Council

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History

School

  • Science

Department

  • Chemistry

Published in

Chinese Journal of Chemistry

Volume

39

Issue

8

Pages

2154-2162

Publisher

Wiley-VCH Verlag

Version

AM (Accepted Manuscript)

Rights holder

© SIOC, CAS, Shanghai, & WILEY-VCH GmbH

Publisher statement

This is the accepted version of the following article: MAO, X. ... et al, 2021. New quinoxaline-based blue emitters: molecular structures, aggregation-induced enhanced emission characteristics and OLED application. Chinese Journal of Chemistry, doi:10.1002/cjoc.202100157, which has been published in final form at https://doi.org/10.1002/cjoc.202100157. This article may be used for non-commercial purposes in accordance with the Wiley Self-Archiving Policy.

Acceptance date

27/04/2021

Publication date

2021-04-29

Copyright date

2021

ISSN

1001-604X

eISSN

1614-7065

Language

en

Depositor

Dr Mark Elsegood. Deposit date: 29 April 2021