Delayed Fluorescence and Amplified Chirality via Modified Substitution Position for Deep-red Circularly Polarized Organic Light Emitting-diodes

doi:10.1007/s40242-024-4123-4

Chemical Research in Chinese Universities ›› 2024, Vol. 40 ›› Issue (4): 657-663.doi: 10.1007/s40242-024-4123-4

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Delayed Fluorescence and Amplified Chirality via Modified Substitution Position for Deep-red Circularly Polarized Organic Light Emitting-diodes

ZHU Lixun¹, LIU Dan², WU Kaiwen¹, XIE Guohua³, ZHAO Zheng¹, TANG Ben Zhong^1,2

1. School of Science and Engineering, Shenzhen Institute of Aggregate Science and Technology, The Chinese University of Hong Kong, Shenzhen (CUHK-Shenzhen), Shenzhen 518172, P. R. China;
2. Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science and Technology, Hongkong 999077, P. R. China;
3. The Institute of Flexible Electronics (Future Technologies), Xiamen University, Xiamen 361005, P. R. China

Received:2024-05-14 Online:2024-08-01 Published:2024-07-24
Contact: XIE Guohua,ifeghxie@xmu.edu.cn;ZHAO Zheng,zhaozheng@cuhk.edu.cn;TANG Ben Zhong,tangbenz@cuhk.edu.cn E-mail:ifeghxie@xmu.edu.cn;zhaozheng@cuhk.edu.cn;tangbenz@cuhk.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (Nos. 52273197 and 52333007), the Project of the Shenzhen Key Laboratory of Functional Aggregate Materials, China (No. ZDSYS20211021111400001), the Project of the Science Technology Innovation Commission of Shenzhen Municipality, China (Nos. JCYJ2021324134613038, KQTD20210811090142053, JCYJ20220818103007014, GJHZ20210705141810031) and the Project of the Innovation and Technology Commission, China (No. ITC-CNERC14SC01).

Abstract

Abstract: Developing easily accessible deep-red/near-infrared circularly polarized emitters for practical organic light-emitting diodes remains a significant challenge. Here, a practical strategy has been proposed for developing deep-red circularly polarized delayed fluorescent emitters based on a novel chiral acceptor platform. By changing triphenylamine (TPA) substitution position from para to meta, R/S-M-TBBTCN demonstrated thermally activated delayed fluorescence (TADF) properties with a delayed lifetime of 6.6 μs that R/S-P-TBBTCN doesn’t have. Furthermore, R/S-M-TBBTCN showed a 65 nm red-shift in emission and a 10-fold enhancement in asymmetry factor (g_lum), compared with R/S-P-TBBTCN. The solution-processed nondoped circularly polarized organic light-emitting diodes (CP-OLEDs) based on R-M-TBBTCN display deep-red emission and 2.2% external quantum efficiency.

Key words: Amplified chirality, Deep-red circularly polarized organic light emitting-diode, Binaphthol based chiral acceptor

ZHU Lixun, LIU Dan, WU Kaiwen, XIE Guohua, ZHAO Zheng, TANG Ben Zhong. Delayed Fluorescence and Amplified Chirality via Modified Substitution Position for Deep-red Circularly Polarized Organic Light Emitting-diodes[J]. Chemical Research in Chinese Universities, 2024, 40(4): 657-663.

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Delayed Fluorescence and Amplified Chirality via Modified Substitution Position for Deep-red Circularly Polarized Organic Light Emitting-diodes

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