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Article

Efficient Red Thermally Activated Delayed Fluorescence Emitters Based on a Dibenzonitrile-Substituted Dipyrido[3,2-a:2′,3′-c]phenazine Acceptor

Department of Chemistry, Hubei Key Laboratory on Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072, China
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Authors to whom correspondence should be addressed.
Academic Editors: Mario Berberan-Santos, Guohua Xie, Chien-Jung Huang and Kuan-Wei Lee
Molecules 2021, 26(9), 2427; https://doi.org/10.3390/molecules26092427
Received: 12 April 2021 / Revised: 16 April 2021 / Accepted: 17 April 2021 / Published: 22 April 2021
How to construct efficient red-emitting thermally activated delayed fluorescence (TADF) materials is a challenging task in the field of organic light-emitting diodes (OLEDs). Herein, an electron acceptor moiety, 3,6-DCNB-DPPZ, with high rigidity and strong acceptor strength was designed by introducing two cyanobenzene groups into the 3,6-positions of a dipyrido[3,2-a:2′,3′-c]phenazine unit. A red-emitting compound, 3,6_R, has been designed and synthesized by combining the rigid acceptor unit with two triphenylamine donors. Due to high molecular rigidity and strong intramolecular charge transfer characteristic in donor–acceptor–donor skeleton, 3,6_R exhibited a red emission with a high photoluminescence quantum yield of 86% and distinct TADF nature with short delayed fluorescence lifetime of about 1 microsecond. Accordingly, the OLED using 3,6_R as the guest emitter gained a high external quantum efficiency of 12.0% in the red region with an electroluminescence peak of 619 nm and favorable Commission Internationale de l’Eclairage coordinates of (0.62, 0.38). View Full-Text
Keywords: organic light-emitting diodes; thermally activated delay fluorescence; red emitter; electron acceptor organic light-emitting diodes; thermally activated delay fluorescence; red emitter; electron acceptor
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MDPI and ACS Style

He, L.; Zeng, X.; Ning, W.; Ying, A.; Luo, Y.; Gong, S. Efficient Red Thermally Activated Delayed Fluorescence Emitters Based on a Dibenzonitrile-Substituted Dipyrido[3,2-a:2′,3′-c]phenazine Acceptor. Molecules 2021, 26, 2427. https://doi.org/10.3390/molecules26092427

AMA Style

He L, Zeng X, Ning W, Ying A, Luo Y, Gong S. Efficient Red Thermally Activated Delayed Fluorescence Emitters Based on a Dibenzonitrile-Substituted Dipyrido[3,2-a:2′,3′-c]phenazine Acceptor. Molecules. 2021; 26(9):2427. https://doi.org/10.3390/molecules26092427

Chicago/Turabian Style

He, Lin, Xuan Zeng, Weimin Ning, Ao Ying, Yunbai Luo, and Shaolong Gong. 2021. "Efficient Red Thermally Activated Delayed Fluorescence Emitters Based on a Dibenzonitrile-Substituted Dipyrido[3,2-a:2′,3′-c]phenazine Acceptor" Molecules 26, no. 9: 2427. https://doi.org/10.3390/molecules26092427

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