Thermally activated delayed fluorescence materialsensitized helicene enantiomer-based OLEDs:a new strategy for improving the efficiency of circularly polarized electroluminescence

作     者：Meng Li Yin-Feng Wang Da-Wei Zhang Dongdong Zhang Zhi-Qiang Hu Lian Duan Chuan-Feng Chen 李猛;王银凤;张大伟;张东东;胡志强;段炼;陈传峰

作者机构：Beijing National Laboratory for Molecular SciencesCAS Key Laboratory of Molecular Recognition and FunctionInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of SciencesBeijing 100049China Department of ChemistryTsinghua UniversityBeijing 100084China College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China 

基　　金：the National Natural Science Foundation of China(21871272,91956119 and 21521002) the Youth Innovation Promotion Association CAS(2019034) Qingdao University of Science and Technology(QUSTHX201929) 

出 版 物：《Science China Materials》 (中国科学（材料科学（英文版）)

年 卷 期：2021年第64卷第4期

页      码：899-908页

摘      要：A new strategy of thermally activated delayed fluorescence(TADF)material-sensitized circularly polarized luminescence(CPL)has been proposed for improving the efficiencies of fluorescent circularly polarized organic lightemitting diodes(OLEDs)(CP-OLEDs).Consequently,a pair of helicene enantiomers,(P)-HAI and(M)-HAI,were *** helicene enantiomers with the rigid helicalπ-skeleton had highly thermal and enantiomeric stabilities,and they also showed excellent photophysical properties,especially,intense mirror-image CPL activities with large luminescence dissymmetry factor(|g_(lum)|)values of about 6×10^(-3).Notably,the CP-OLEDs with the helicene enantiomers as emitters and a TADF molecule as sensitizer not only displayed better performance of lower turn-on voltage(V_(T))of 2.6 V,four-fold maxmium-external quantum efficiency(EQE_(max))of 5.3%,and lower efficiencies roll-off of 1.9%at 1000 cd m^(-2),than those of the devices without TADF sensitizer,but also exhibited intense circularly polarized electroluminescence(CPEL)with the electroluminescence dissymmetry factor(g_(EL))values of-2.3×10^(-3)and+3.0×10^(-3).Meanwhile,this study also represents the first thermally activated sensitized fluorescent CP-OLEDs with markedly enhanced efficiencies and intense CPEL.

主 题 词：thermally activated sensitized emission helicene electroluminescence circularly polarized light organic lightemitting diodes 

学科分类：08[工学] 0803[工学-仪器类] 

核心收录：

D　O　I：10.1007/s40843-020-1496-7

馆 藏 号：203992934...