Synthesis and Electroluminescence Properties of Delayed Fluorescent Materials Based on Bis(benzenesulfonyl)benzene
WANG Dahao1, XIE Fengming2, WEI Huaixin1, HU Yingyuan1, ZHAO Xin1,*
1 College of Chemistry and Life Sciences, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, China 2 Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, Jiangsu, China
Abstract: Two thermally activated delayed fluorescence (TADF) materials with a twisted D-A-D structure, 1,3-bis(3-diphenylaminobenzenesulfonyl)benzene (PSPA) and 1,3-bis((3-(10H phenoxazin-10-yl)phenyl)sulfonyl)benzene (PSPP), were designed and synthesized by using 1,3-bis(phenylsulfonyl)benzene as the acceptor group (A) and diphenylamine/phenoxazine as the donor groups (D). A large twisted structure can be achieved by the attachment of the donor group at the 3,3′-position of 1,3-bis(phenylsulfonyl)benzene. Limited overlap of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) was achieved, which obtained smaller ΔESTs (0.21 eV for PSPA and 0.016 eV for PSPP) and better PLQYs (4.36% for PSPA and 37.36% for PSPP). The transient fluorescence spectra show that both emitters possess typical delayed fluorescence characteristics. The PSPA-based device shows blue emission (450 nm), and the PSPP-based device emits green light at 520 nm with red-shifted emission due to the strong electron-donating ability of phenoxazine. The PSPP-based device obtained a greater maximum external quantum efficiency (EQEmax) of 4.48% than that of PSPA.
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2023, Vol. 37 
