Design high-performance narrowband emitters for blue light-emitting diodes through manipulating resonance structure of aromatic heterocycles
作者机构：Institute of Polymer Optoelectronic Materials and Devices Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials State Key Laboratory of Luminescent Materials and Devices South China University of Technology School of Petrochemical Engineering Shenyang University of Technology Key Laboratory for Microstructural Material Physics of Hebei Province School of Science Yanshan University
出 版 物：《Science China Chemistry》 (中国科学:化学(英文版))
年 卷 期：2025年
核心收录：
学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0803[工学-光学工程]
基 金：supported by the National Key R&D Program of China (2020YFA0714604) the Guangdong Major Project of Basic and Applied Basic Research (2019B030302007) the China Postdoctoral Science Foundation (2023M731163) the Fund of Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates (2023B1212060003) the Fundamental Research Funds of State Key Laboratory of Luminescent Materials and Devices (Skllmd-2023-09) the SSL Sci-tech Commissioner Program (20234383-01KCJ-G)
摘 要：Narrowband light-emitting materials play critical roles in improving the color gamut and energy consumption of electroluminescence. Herein we demonstrated that by regulating the ground state resonance structure form of emitters with polycyclic aromatic heterocycles, the high-energy vibration of the C–C bond can be effectively suppressed, resulting in narrow emission like classical cyanine dyes. The designed compounds consist of twist and planar conformation, while having differences in the orientation of the positioning electron-donating(nitrogen) and electron-accepting(carbonyl) groups in the polycyclic aromatic hydrocarbon skeleton. The resulting compound Ac-Ph-Ac with a dominated zwitterionic resonance structure exhibits a relatively wide electroluminescent profile with the full width at half maximum(FWHM) of 42 nm and moderate device performance. In contrast, the “soliton transition of 2AcPh based on the cyanine limit character effectively suppresses C–C stretching vibration in the polycyclic aromatic heterocycle skeleton, leading to a narrow electroluminescent profile with FWHM of 30 nm(0.16 eV)associated with an impressively high external quantum efficiency of 28.52%, which is among the highest efficiencies of so far reported non-sensitized organic light-emitting diodes.
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