基于蒽醌的红色延迟荧光材料的设计合成及光电性质  

Design,Synthesis and Optoelectronic Properties of Red Delayed Fluorescence Materials Based on Anthraquinone

作　　者：江如明 刘昊 徐静文 赵祖金[1] 唐本忠[1,2] JIANG Ruming;LIU Hao;XU Jingwen;ZHAO Zujin;TANG Benzhong(State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640,China;School of Science and Engineering,The Chinese University of Hong Kong,Shenzhen 518172,China)

机构地区：[1]华南理工大学发光材料与器件国家重点实验室,广州510640 [2]香港中文大学科学与工程学院,深圳518172

出　　处：《集成技术》2023年第6期1-13,共13页Journal of Integration Technology

基　　金：国家自然科学基金项目(21788102);广东省自然科学基金面上项目(2022A1515010315)。

摘　　要：由于受到能隙定律的严重约束,激发态的有机红光材料的非辐射衰减较大,从而导致其荧光量子产率普遍较低。该文利用电子给/受体(donor-acceptor,D-A)之间不同的连接方式,在有无苯环作为π桥的情况下合成了AQ-2DPAC和AQ-2PDPAC两种红光蒽醌材料。并系统地研究了上述两种材料的电子结构、热性能、光物理性能和电致发光性能,以评估苯环作为π桥对材料发光性能的影响。两种蒽醌材料采取高度扭曲构造,均具有优良的聚集诱导发光和延迟荧光特性。该研究表明,就两种电荷转移发光材料而言,苯环作为π桥的引入使D-A得到了更有效的分离,并减小了最低单重态和三重态激发态之间的能级差,提高了辐射复合速率,从而提高荧光量子产率。因此,荧光量子产率从D-A型分子AQ-2DPAC的19%显著提升至D-π-A型分子AQ-2PDPAC的52%。采用AQ-2PDPAC发光材料的有机发光二极管器件性能更为优异,最大外量子效率为13.7%,最大亮度为12260 cd·m^(-2)。Organic red luminogens are seriously bound by that of the energy gap law,giving rise to severe nonradiative decay of excited state and consequently low photoluminescence quantum yield(ΦPL).Herein,two red anthraquinone-based luminogens,AQ-2DPAC and AQ-2PDPAC,are synthesized by using different linking modes between the electron donor and the electron acceptor(D-A)with or without the phenyl ring asπ-bridge.Their electronic structures,thermal properties,photophysical properties,and electroluminescent properties are investigated systematically to assess the impact of the phenyl bridge on their photoluminescence properties.Both highly twisted luminogens exhibit obvious aggregation-induced emission and delayed fluorescence features,and the elongation of D-A separation distance via the introduction of phenyl bridge can simultaneously decrease singlet-triplet energy splitting,enhance fluorescence decay rate and consequently increaseΦPL.Therefore,theΦPL of D-π-A-type AQ-2PDPAC(52%)is much larger than that of D-A-type AQ-2DPAC(19%).The organic light-emitting diode employing AQ-2PDPAC as emitter realizes a high maximum external quantum efficiency of 13.7%,and a maxima luminance of 12260 cd·m^(-2).

关 键 词：有机红光材料 延迟荧光 聚集诱导发光 荧光量子产率 蒽醌 有机发光二极管 

分 类 号：TG156[金属学及工艺—热处理]