Chinese Journal of Organic Chemistry >
Blue Aggregation-Induced Delayed Fluorescence Materials with 5,10-Dihydrodibenzo[b,e][1,4]azasiline as Donor
Received date: 2024-03-28
Revised date: 2024-06-20
Online published: 2024-07-02
Supported by
National Natural Science Foundation of China(U23A20594); National Natural Science Foundation of China(22375066); Guangdong Basic and Applied Basic Research Foundation(2023B1515040003); Guangdong Basic and Applied Basic Research Foundation(2022A1515010315); Guangdong Basic and Applied Basic Research Foundation(2021A1515110826); Guangzhou Science and Technology Planning Project(202201010439)
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 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 materials for the preparation of high-performance
Junchu He , Junqi Wu , Jianghui Wang , Jingwen Xu , BenZhong Tang , Zujin Zhao . Blue Aggregation-Induced Delayed Fluorescence Materials with 5,10-Dihydrodibenzo[b,e][1,4]azasiline as Donor[J]. Chinese Journal of Organic Chemistry, 2024 , 44(8) : 2513 -2522 . DOI: 10.6023/cjoc202403047
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