Constructing Charge-Transfer Excited States Based on Frontier Molecular Orbital Engineering: Narrowband Green Electroluminescence with High Color Purity and Efficiency |
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Authors: | Yincai Xu Dr. Chenglong Li Dr. Zhiqiang Li Qingyang Wang Xinliang Cai Dr. Jinbei Wei Prof. Yue Wang |
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Affiliation: | 1. State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012 China;2. Jihua Laboratory, 13 Nanpingxi Road, Foshan, 528200 Guangdong Province, China |
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Abstract: | The design and synthesis of organic materials with a narrow emission band in the longer wavelength region beyond 510 nm remain a great challenge. For constructing narrowband green emitters, we propose a unique molecular design strategy based on frontier molecular orbital engineering (FMOE), which can integrate the advantages of a twisted donor–acceptor (D-A) structure and a multiple resonance (MR) delayed fluorescence skeleton. Attaching an auxiliary donor to a MR skeleton leads to a novel molecule with twisted D-A and MR structure characteristics. Importantly, a remarkable red-shift of the emission maximum and a narrowband spectrum are achieved simultaneously. The target molecule has been employed as an emitter to fabricate green organic light-emitting diodes (OLEDs) with Commission Internationale de L'Eclairage (CIE) coordinates of (0.23, 0.69) and a maximum external quantum efficiency (EQE) of 27.0 %. |
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Keywords: | donor–acceptor structures electroluminescence green emission organic light-emitting diodes thermally activated delayed fluorescence |
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