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热激活延迟荧光材料敏化的螺烯对映体有机发光二极管:一种提高电致圆偏振发光效率的新策略
引用本文:李猛,王银凤,张大伟,张东东,胡志强,段炼,陈传峰. 热激活延迟荧光材料敏化的螺烯对映体有机发光二极管:一种提高电致圆偏振发光效率的新策略[J]. SCIENCE CHINA Materials, 2021, 0(4): 899-908
作者姓名:李猛  王银凤  张大伟  张东东  胡志强  段炼  陈传峰
作者单位:Beijing National Laboratory for Molecular Sciences;University of Chinese Academy of Sciences;Department of Chemistry;College of Chemistry and Molecular Engineering
基金项目: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)。
摘    要:为了提高基于手性荧光分子的有机圆偏振发光二极管(CPOLED)器件效率,本文提出了一种全新的热激活延迟荧光材料敏化圆偏振发光(TAS-CPL)的策略.设计合成了一对具有刚性骨架的螺烯对映体(P)-HAI和(M)-HAI作为器件的手性发光客体,研究发现螺烯对映体具有高的热稳定性、手性构型稳定性、良好的光物理性质,尤其是具...

关 键 词:有机发光二极管  外量子效率  电致发光  不对称因子  发光效率  OLED  圆偏振  启动电压

Thermally activated delayed fluorescence materialsensitized helicene enantiomer-based OLEDs:a new strategy for improving the efficiency of circularly polarized electroluminescence
Meng Li,Yin-Feng Wang,Da-Wei Zhang,Dongdong Zhang,Zhi-Qiang Hu,Lian Duan,Chuan-Feng Chen. Thermally activated delayed fluorescence materialsensitized helicene enantiomer-based OLEDs:a new strategy for improving the efficiency of circularly polarized electroluminescence[J]. , 2021, 0(4): 899-908
Authors:Meng Li  Yin-Feng Wang  Da-Wei Zhang  Dongdong Zhang  Zhi-Qiang Hu  Lian Duan  Chuan-Feng Chen
Affiliation:(Beijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Molecular Recognition and Function,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Department of Chemistry,Tsinghua University,Beijing 100084,China;College of Chemistry and Molecular Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)
Abstract: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 synthesized.The 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(|glum|)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(VT)of 2.6 V,four-fold maxmium-external quantum efficiency(EQEmax)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(gEL)values of-2.3×10-3and+3.0×10-3.Meanwhile,this study also represents the first thermally activated sensitized fluorescent CP-OLEDs with markedly enhanced efficiencies and intense CPEL.
Keywords:thermally activated sensitized emission  helicene  electroluminescence  circularly polarized light  organic lightemitting diodes
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