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New Quinoxaline‐Based Blue Emitters: Molecular Structures, Aggregation‐Induced Enhanced Emission Characteristics and OLED Application
Author(s) -
Mao Xiaoyu,
Xie Fuli,
Wang Xiaohui,
Wang Qingsong,
Qiu Zhipeng,
Elsegood Mark R. J.,
Bai Jie,
Feng Xing,
Redshaw Carl,
Huo Yanping,
Hu JianYong,
Chen Qing
Publication year - 2021
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.202100157
Subject(s) - chemistry , quinoxaline , oled , electroluminescence , phosphorescence , stacking , full width at half maximum , pyrene , photochemistry , crystallography , analytical chemistry (journal) , optoelectronics , layer (electronics) , organic chemistry , fluorescence , materials science , physics , quantum mechanics
Main observation and conclusion 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 1 H/ 13 C NMR spectroscopy, single crystal X‐ray diffraction, and high‐resolution mass spectrometry (HRMS). The designed molecules exhibit good thermal stability ( T g > 452 o C). 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).