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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 https://orcid.org/0000-0002-1835-0418 (unconfirmed) Kaji, Hironori 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 |
This item is licensed under a Creative Commons License