以二苯基硅杂吖啶为电子给体的蓝色聚集诱导延迟荧光材料  

Blue Aggregation-Induced Delayed Fluorescence Materials with 5,10-Dihydrodibenzo[b,e][1,4]azasiline as Donor

作　　者：何俊初 伍俊琪 王江辉 徐静文 唐本忠 赵祖金[1] He Junchu;Wu Junqi;Wang Jianghui;Xu Jingwen;Tang Ben Zhong;Zhao Zujin(State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640;School of Science and Engineering,The Chinese University of Hong Kong,Shenzhen,Guangdong 518172)

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(深圳)理工学院,广东深圳518172

出　　处：《有机化学》2024年第8期2513-2522,共10页Chinese Journal of Organic Chemistry

基　　金：国家自然科学基金(Nos.U23A20594,22375066);广东省基础与应用基础研究基金(Nos.2023B1515040003,2022A1515010315,2021A1515110826);广州市科技计划(No.202201010439)资助项目。

摘　　要：以硅杂吖啶(DPDBA)和咔唑衍生物作为电子给体、苯甲酮作为电子受体构筑给体-受体-给体(D-A-D')型分子,开发了三个蓝光材料.对材料的热稳定性、电化学性质、单晶结构、光物理性质和电致发光性能等进行了系统研究.三个材料具有较小的单线态-三线态能级差以及微秒级别的延迟荧光寿命,并表现出显著的聚集诱导延迟荧光(AIDF)特性.以这些材料作为发光层制备的有机发光二极管(OLED)的最大外量子效率(EQE)达到14.8%,发光峰在474~476 nm.由于这些AIDF分子具有良好的双极载流子传输性能,将这些材料作为主体材料制备了不同光色的磷光OLED器件,器件表现出较为优秀的性能,其中黄光和绿光器件的EQE分别为25.5%和21.2%,在1000 cd·m^(-2)亮度下效率滚降非常小.因此,所制备的这些AIDF分子可分别作为发光材料和主体材料用于高性能OLED器件的制备,具有较好的应用前景.Three blue-emitting materials were developed using 10,10-diphenyl-5,10-dihydrodibenzo[b,e][1,4]azasiline(DPDBA)and carbazole derivative as donors,and benzophenone as acceptor to construct donor-acceptor-donor(D-A-D')type molecules,and their thermal stability,electrochemical properties,single crystal structure,photophysical properties and electroluminescence properties were systematically studied.And they have small singlet-triplet energy splitting and microsecondscale delayed lifetimes,showing obvious aggregation-induced delayed fluorescence(AIDF)characteristics.As light-emitting layers of organic light-emitting diodes(OLEDs),the electroluminescence peaks of these compounds are in the range of 474~476 nm,and the maximum external quantum efficiency(EQE)can reach 14.8%.Additionally,these compounds exhibit good bipolar carrier transport performance,and can be used as host materials for phosphorescent devices.The maximum EQEs of green and yellow phosphorescent OLEDs are 25.5%and 21.2%,respectively,and the efficiency roll-off at 1000 cd·m^(-2) is very small.These results indicate that these AIDF compounds can be used not only as luminescent materials but also as host materials for the preparation of high-performance.

关 键 词：有机发光二极管 聚集诱导延迟荧光 主体材料 聚集诱导发光 

分 类 号：TQ422[化学工程]