宁夏大学学报（自然科学版）2025，Vol.46Issue(4)：377-384,8.DOI:10.20176/j.cnki.nxdz.20251205
通过扭曲给体-受体分子设计实现高性能近红外热活化延迟荧光
High-performance Near-Infrared Thermally Activated Delayed Fluorescence Realized Through Distorted Donor-Acceptor Molecular Design
摘要
Abstract
High-performance near-infrared thermally activated delayed fluorescence(TADF)materials were developed using a design strategy based on distorted donor-acceptor molecular structures,and these materials were employed to construct highly efficient organic light-emitting diode(OLED)devices.In this study,a strong acceptor unit of phenylcyano-modified 6,7-dicyano-2,3-(9,10-phenanthrene)quinoxaline was combined with a distorted donor unit of tert-butyl triphenylamine.The novel luminescent material CPDBP-BuTPA was successfully synthesized via Suzuki coupling reaction,and various methods including density functional theory calculations,thermogravimetric analysis,cyclic voltammetry,UV-visible absorption spectroscopy,fluores-cence spectroscopy,and time-resolved fluorescence decay spectroscopy were employed for systematic character-ization of the luminescent material.The results indicate that the luminescent material molecules possess a highly twisted geometric configuration,which effectively facilitates the separation of frontier molecular orbitals,leading to an exceptionally small singlet-triplet energy gap(ΔEST=0.08 eV),while also exhibiting excellent thermal stability,high luminous efficiency,and typical TADF behavior.Devices doped with this material dem-onstrate significant concentration-dependent electroluminescent characteristics:at a doping mass fraction(w)of 1%,the device's electroluminescence emission peak was located at 647 nm,with a maximum external quan-tum efficiency(ηe,m)reaching 28.1%;when w increased to 10%,the electroluminescence emission peak red shifted to 739 nm in the near-infrared region,with ηe,m still maintaining at 9.5%.The molecular configuration distortion design strategy effectively balances the energy level differences,luminous efficiency,and emission wavelength of the materials,providing a feasible design approach for the study of high-performance near-infrared TADF materials.关键词
近红外发光/有机发光二极管/热活化延迟荧光/6,7-二氰基-2,3-(9,10-菲并)喹喔啉Key words
near-infrared luminescence/organic light-emitting diodes/thermally activated delayed fluores-cence/6,7-dicyano-2,3-(9,10-phenanthrene)quinoxaline分类
建筑与水利引用本文复制引用
JIANG Ruming,LIU Xiaowei,LIU Zhangshan,ZHAO Zujin..通过扭曲给体-受体分子设计实现高性能近红外热活化延迟荧光[J].宁夏大学学报（自然科学版）,2025,46(4):377-384,8.基金项目
国家自然科学基金资助项目(22375066,U23A20594) （22375066,U23A20594）
广东省自然科学基金资助项目(2023B1515040003,2024A1515110150) （2023B1515040003,2024A1515110150）
广东省教育厅自然科学基金资助项目(2024KQNCX149) （2024KQNCX149）
