Synthesis and properties of binaphthyl chiral thermally activated delayed fluorescence molecules using thioxanthone as acceptor

作     者：Xiangyu Dong Shaogang Shen Yuanyuan Qin Xiaoxiao Hu Honglei Gao Guanhao Liu Teng Ga Zhi Pang Pengfei Wang Ying Wang Xiangyu Dong;Shaogang Shen;Yuanyuan Qin;Xiaoxiao Hu;Honglei Gao;Guanhao Liu;Teng Gao;Zhi Pang;Pengfei Wang;Ying Wang

作者机构：Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU-CAS Joint Laboratory of Functional Materials and DevicesTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of SciencesBeijing 100049China School of Chemistry and Chemical EngineeringSuzhou UniversitySuzhou 234000China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2023年第34卷第12期

页      面：446-451页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070303[理学-有机化学] 0703[理学-化学] 0803[工学-光学工程] 

基　　金：funded by National Natural Science Foundation of China(No.21772209) International Partnership Program of Chinese Academy of Sciences(IPP)(No.1A1111KYSB20210028) National Program for Support of Top-notch Young Professionals 

主　　题：Thermally activated delayed fluorescence Organic light emitting diodes Binaphthyl skeleton Electronic circular dichroism Circularly polarized luminescence Thioxanthone 

摘      要：The currently reported axial chiral molecules based on the 3,3 -substitution of the binaphthyl skeleton are limited by intrinsic fluorescence properties,resulting in generally low device efficiencies(EQE5%)of related organic light emitting diodes(OLEDs).Herein,we designed and synthesized four pair of chiral binaphthyl enantiomers(R/S-1-R/S-4)adopting acceptor-donor-donor-acceptor(ADDA)structure by introducing different thioxanthone modification groups on the 3,3 -position of 2,2 -dimethoxy-1,1 -*** them,emitter R/S-2 and R/S-4 obtained by enhancing intramolecular charge transfer exhibited TADF characteristics due to relatively small Est of 0.12eV and 0.17eV,and relatively moderate SOC matrix elements of 0.28 cm^(-1)and 0.10 cm^(-1)between the 1CT and 3LE *** CD spectra of these enantiomers in diluted solutions showed perfect mirror images and reasonable gabs for small organic molecules(10^(-4)-10^(-3)).And the external quantum eficiencies(EQE)of 10.9%and 8.32%for device A and B based on emitter S-2 and S-4 were highest compared with currently reported axial chiral molecules based on the 3,3 -position substitution of binaphthyl skeleton,providing simple molecular design strategies to construct efficient CP-OLED device.