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Title: Imidazole Acceptor for Both Vacuum-Processable and Solution-Processable Efficient Blue Thermally Activated Delayed Fluorescence
Authors: Kusakabe, Yu
Wada, Yoshimasa
Misono, Tomoya
Suzuki, Katsuaki
Shizu, Katsuyuki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-1835-0418 (unconfirmed)
Kaji, Hironori  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-5111-3852 (unconfirmed)
Author's alias: 日下部, 悠
和田, 啓幹
美園, 知弥
鈴木, 克明
志津, 功將
梶, 弘典
Keywords: Diodes
External quantum efficiency
Fluorescence
Imidazoles
Materials
Issue Date: 17-May-2022
Publisher: American Chemical Society (ACS)
Journal title: ACS Omega
Volume: 7
Issue: 19
Start page: 16740
End page: 16745
Abstract: The members of the imidazole family have been widely used for electron transporting, host, conventional fluorescent, and phosphorescent materials. Although the imidazole core also has great potential as an acceptor segment of deep-blue thermally activated delayed fluorescence (TADF) owing to its high triplet energy, the emission color of imidazole-based TADF organic light-emitting diodes (OLEDs) has so far been limited to blue to green. In this work, four acridan-imidazole systems are theoretically designed aiming for deep- or pure-blue emitters. All four emitters exhibit deep-blue to blue emission owing to the high energy levels of the lowest excited singlet states, exhibiting y coordinates of Commission Internationale de l’Eclairage coordinates between 0.06 and 0.26. The molecule composed of a trifluoromethyl-substituted benzimidazole acceptor in combination with a tetramethyl-9, 10-dihydroacridine donor (named MAc-FBI) achieves a high maximum external quantum efficiency (EQEMAX) of 13.7% in its application to vacuum-processed OLEDs. The emitter has high solubility even in ecofriendly nonhalogenated solvents, which motivates us to fabricate solution-processed MAc-FBI-based OLEDs, resulting in an even higher EQEMAX of 16.1%.
Rights: Copyright © 2022 The Authors. Published by American Chemical Society
This is an open access article published under a Creative Commons Non-Commercial NoDerivative Works Attribution License, which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes.
URI: http://hdl.handle.net/2433/274630
DOI(Published Version): 10.1021/acsomega.2c01308
PubMed ID: 35601324
Appears in Collections:Journal Articles

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