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
何俊初 1伍俊琪 1王江辉 1徐静文 1唐本忠 2赵祖金1
作者信息
- 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
- 折叠
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.
Abstract
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 elec-troluminescence properties were systematically studied.And they have small singlet-triplet energy splitting and microsecond-scale 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 materi-als 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Key words
organic light-emitting diode(OLED)/aggregation-induced delayed fluorescence(AIDF)/host material/aggrega-tion-induced emission引用本文复制引用
基金项目
国家自然科学基金(U23A20594)
国家自然科学基金(22375066)
广东省基础与应用基础研究基金(2023B1515040003)
广东省基础与应用基础研究基金(2022A1515010315)
广东省基础与应用基础研究基金(2021A1515110826)
广州市科技计划(202201010439)
出版年
2024
NETL
NSTL
万方数据