双苯磺酰基苯类延迟荧光材料的合成及电致发光性质  

Synthesis and Electroluminescence Properties of Delayed Fluorescent Materials Based on Bis(benzenesulfonyl)benzene

作　　者：王达浩 谢凤鸣 魏怀鑫[1] 胡英元 赵鑫[1] WANG Dahao;XIE Fengming;WEI Huaixin;HU Yingyuan;ZHAO Xin(College of Chemistry and Life Sciences,Suzhou University of Science and Technology,Suzhou 215009,Jiangsu,China;Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices,Institute of Functional Nano&Soft Materials(FUNSOM),Soochow University,Suzhou 215123,Jiangsu,China)

机构地区：[1]苏州科技大学化学与生命科学学院,江苏苏州215009 [2]苏州大学功能纳米与软物质研究院,江苏省碳基功能材料与器件重点实验室,江苏苏州215123

出　　处：《材料导报》2023年第4期211-215,共5页Materials Reports

基　　金：国家自然科学基金(61705154,21905048)。

摘　　要：以1,3-双(苯磺酰基)苯为受体基团(A)、二苯胺和吩噁嗪分别为供体基团(D),设计合成了两种具有扭曲D-A-D结构的热激活延迟荧光(TADF)材料:1,3-双(3-二苯氨基苯磺酰基)苯(PSPA)和1,3-双(3-吩噁嗪-10-基苯磺酰基)苯(PSPP)。在1,3-双(苯磺酰基)苯的3,3′-位连接供体基团,使供体和受体之间有较大的扭曲角,实现了最高占据分子轨道(HOMO)和最低未占据分子轨道(LUMO)的有限重叠,获得了较小的ΔE ST(分别为0.21 eV和0.016 eV)和较好的光致发光量子产率(PLQYs,分别为4.36%和37.36%)。瞬态荧光谱表明,PSPA和PSPP都具有典型的延迟荧光特性。基于PSPA的器件呈现蓝光发射(450 nm);基于PSPP的器件因吩噁嗪的强给电子能力,在520 nm处发射绿光,发射峰红移,且其最大外量子效率大于PSPA,达到4.48%。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 smallerΔE ST s(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(EQE max)of 4.48%than that of PSPA.

关 键 词：热激活延迟荧光 有机发光二极管 双(苯磺酰基)苯 电致发光性质 

分 类 号：O621.22[理学—有机化学]