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Precise Regulation of Emission Maxima and Construction of Highly Efficient Electroluminescent Materials with High Color Purity
Authors:Qingyang Wang  Dr Yincai Xu  Tingting Huang  Yupei Qu  Jianan Xue  Dr Baoyan Liang  Prof Yue Wang
Institution:1. State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012 P. R. China;2. Jihua Laboratory, 28 Huandao South Road, Foshan, 528200 Guangdong Province, P. R. China
Abstract:Advanced multiple resonance induced thermally activated delayed fluorescence (MR-TADF) emitters have emerged as a privileged motif for applications in organic light-emitting diodes (OLEDs), because they furnish highly tunable TADF characteristics and high color purity emission. Herein, based on the unique nitrogen-atom embedding molecular engineering (NEME) strategy, a series of compounds BN-TP-Nx (x=1, 2, 3, 4) have been customized. The nitrogen-atom anchored at different position of triphenylene hexagonal lattice entails varying degrees of perturbation to the electronic structure. The newly-constructed emitters have demonstrated the precise regulation of emission maxima of MR-TADF emitters to meet the actual industrial demand, and further enormously enriched the MR-TADF molecular reservoir. The BN-TP-N3-based OLED exhibits ultrapure green emission, with peak of 524 nm, full-width at half-maximum (FWHM) of 33 nm, Commission Internationale de L'Eclairage (CIE) coordinates of (0.23, 0.71), and maximum external quantum efficiency (EQE) of 37.3 %.
Keywords:Green Emission  High Color Purity  Molecular Engineering  Multiple Resonance  Organic Light-Emitting Diodes
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