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 light-emitting diodes (OLEDs) (CP-OLEDs). Consequently, a pair of helicene enantiomers, (P)-HAI and (M)-HAI, were synthesized. The helicene enantiomers with the rigid helical π-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 × 10−3 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.
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, 尤其是具有强的CPL性质, 其荧光不对称因子(|glum|)约为 6×10−3. 与直接以螺烯对映体作为发光客体的CP-OLED相比, 通过 TADF敏化剂热激活敏化螺烯对映体的CP-OLED表现出更低的启 动电压(2.6 V)、更低的效率滚降(1.9%, 亮度为1000 cd m−2)以及增 加四倍的最大外量子效率(EQEmax, 5.3%), 螺烯对映体的电致发光 不对称因子分别为−2.3×10−3和+3.0×10−3. 这是首例基于热激活延 迟荧光材料敏化圆偏振发光的CP-OLED, 为提高手性荧光分子的 电致圆偏振发光效率提供了有效策略.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21871272, 91956119 and 21521002), the Youth Innovation Promotion Association CAS (2019034), and Qingdao University of Science and Technology (QUSTHX201929).
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Li M, Zhang DW and Chen CF designed the whole study; Li M and Wang YF synthesized the organic compounds; Li M and Zhang DW characterized the properties of compounds; Zhang DW and Li M fabricated and optimized the devices; Li M wrote the paper with support from Hu ZQ, Duan L and Chen CF. All authors contributed to the general discussion.
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The authors declare no conflict of interest.
Meng Li received his PhD from the Institute of Chemistry, Chinese Academy of Sciences in 2015 under the supervision of Prof. Chuan-Feng Chen. He is currently working as an associate professor at the Institute of Chemistry, Chinese Academy of Sciences. His research interests focus on the chiral optoelectronic materials and devices.
Dongdong Zhang received his PhD from the Department of Chemistry, Tsinghua University, in 2016, under the supervision of Prof. Yong Qiu and Prof. Lian Duan. Currently he is working at Tsinghua University. His research interests focus on developing new TADF materials as emitters or hosts for high-performance OLEDs.
Chuan-Feng Chen has been working as a full professor of organic chemistry at the Institute of Chemistry, Chinese Academy of Sciences since 2001. His current research interests include supramolecular chemistry based on synthetic macrocyclic hosts (helic[n]arenes, pagoda[n] arenes), molecular machines and stimulus responsive supramolecular materials, optoelectronic materials and devices, and helicene chemistry.
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Thermally activated delayed fluorescence material-sensitized helicene enantiomer-based OLEDs: a new strategy for improving the efficiency of circularly polarized electroluminescence
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Li, M., Wang, YF., Zhang, DW. et al. Thermally activated delayed fluorescence material-sensitized helicene enantiomer-based OLEDs: a new strategy for improving the efficiency of circularly polarized electroluminescence. Sci. China Mater. 64, 899–908 (2021). https://doi.org/10.1007/s40843-020-1496-7
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DOI: https://doi.org/10.1007/s40843-020-1496-7