| 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 |
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| 作者姓名： | 李猛 王银凤 张大伟 张东东 胡志强 段炼 陈传峰 |
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| 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 |
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| 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)。 |
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| 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...
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| 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 |
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| Authors: | Meng Li Yin-Feng Wang Da-Wei Zhang Dongdong Zhang Zhi-Qiang Hu Lian Duan Chuan-Feng Chen |
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| 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) |
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| 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. |
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| Keywords: | thermally activated sensitized emission helicene electroluminescence circularly polarized light organic lightemitting diodes |
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