高等学校化学学报2025，Vol.46Issue(5)：75-83,9.DOI:10.7503/cjcu20240494
基于螺芴基团的红光热激活延迟荧光材料
Red Light Thermally Activated Delayed Fluorescence Materials Based on Spirofluorene Units
摘要
Abstract
On the basis of commonly used triphenylamine donor units and dibenzo[a,c]phenazine acceptor units,two red light thermally activated delayed fluorescence(TADF)materials TPA-DSP and SPTPA-DSP were designed and synthesized by the steric hindrance effect of spirofluorene group.The spirofluorene group,known for its large steric hindrance,increases the rigidity of the molecule,avoids tight packing between emissive cores and effectively reduces non-radiative transition energy loss,which is crucial for improving device performance.When doping in 4,4′-bis(N-carbazolyl)-1,1′-biphenyl(CBP)as organic light emitting layer,TPA-DSP and SPTPA-DSP exhibited excellent performance in organic light-emitting diodes(OLEDs).Both materials emitted red light,with TPA-DSP achieving a maximum external quantum efficiency(EQE)of 17.8%at 580 nm with a 7%doping concentration(mass fraction).SPTPA-DSP,featuring multiple spirofluorene groups,demonstrated superior device performance,achieving a maximum EQE of 19.3%at 580 nm with a 7%doping concentration(mass fraction).The maximum luminance of TPA-DSP and SPTPA-DSP reached 11800 and 12650 cd/m2,the maximum current efficiency(CE)both reached 40.0 cd/A,and the maximum power efficiency(PE)reached 44.3 and 47.2 lm/W,respectively.Notably,SPTPA-DSP,featuring multiple spirofluorene groups,demonstrated superior device performance due to its greater steric hindrance.Our findings underscore the potential of the spirofluorene group to enhance the performance of TADF materials through steric hindrance effects,which not only contributes to understanding the effect of steric hindrance in TADF but also paves the way for further advancements and applications.关键词
热激活延迟荧光/红光/空间位阻/螺芴Key words
Thermally activated delayed fluorescence/Red luminescence/Steric hindrance/Spirofluorene分类
化学引用本文复制引用
高珊,巩世烜,靳雨鑫,陈子奇,马金珠,冯敏强,樊健..基于螺芴基团的红光热激活延迟荧光材料[J].高等学校化学学报,2025,46(5):75-83,9.基金项目
国家重点研究发展计划项目(批准号:2020YFA0714604)、国家自然科学基金(批准号:22005184)和江苏省国际科技合作/港澳台科技合作项目(批准号:BZ2023053)资助. Supported by the National Key Research and Development Program of China(No.2020YFA0714604),the National Natural Science Foundation of China(No.22005184)and the International Science and Technology Innovation Cooperation/Hong Kong,Macao and Taiwan Science and Technology Innovation Cooperation Project of Jiangsu Province,China(No.BZ2023053). （批准号:2020YFA0714604）
