Asymmetric Thermally Activated Delayed Fluorescence Materials Rendering High-performance OLEDs Through both Thermal Evaporation and Solution-processing

doi:10.1007/s40242-022-2111-0

高等学校化学研究 ›› 2022, Vol. 38 ›› Issue (6): 1526-1531.doi: 10.1007/s40242-022-2111-0

Asymmetric Thermally Activated Delayed Fluorescence Materials Rendering High-performance OLEDs Through both Thermal Evaporation and Solution-processing

GAO Shiyuan¹, CHEN Xiaojie², GE Xiangyu², CHEN Zhu², ZHAO Juan¹, CHI Zhenguo^1,2

1. State Key Laboratory of OEMT, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China;
2. State Key Laboratory of OEMT, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, P. R. China

收稿日期:2022-03-28 出版日期:2022-12-01 发布日期:2022-12-06
通讯作者: CHI Zhenguo, ZHAO Juan E-mail:chizhg@mail.sysu.edu.cn;zhaoj95@mail.sysu.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China(Nos.52073316, 51733010, 51973239) and the Science and Technology Planning Project of Guangzhou City, China(No.202102020951).

Asymmetric Thermally Activated Delayed Fluorescence Materials Rendering High-performance OLEDs Through both Thermal Evaporation and Solution-processing

GAO Shiyuan¹, CHEN Xiaojie², GE Xiangyu², CHEN Zhu², ZHAO Juan¹, CHI Zhenguo^1,2

1. State Key Laboratory of OEMT, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China;
2. State Key Laboratory of OEMT, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, P. R. China

Received:2022-03-28 Online:2022-12-01 Published:2022-12-06
Contact: CHI Zhenguo, ZHAO Juan E-mail:chizhg@mail.sysu.edu.cn;zhaoj95@mail.sysu.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China(Nos.52073316, 51733010, 51973239) and the Science and Technology Planning Project of Guangzhou City, China(No.202102020951).

摘要/Abstract

摘要： Exploring high-efficiency thermally activated delayed fluorescence(TADF) materials is of great importance regarding to organic light-emitting diode(OLED). Herein, we present a design strategy for developing asymmetric TADF materials based on a diphenyl sulfone-phenoxazine structure, resulting in efficient TADF emitters(CzPXZ and t-CzPXZ) with aggregation-induced emission properties, while t-CzPXZ is modified with tert-butyl groups. The two compounds exhibit high solid-state luminescence, efficient TADF, and significantly impressive device performances by both thermal evaporation and solution processing. For an instance, CzPXZ and t-CzPXZ enable the thermally-evaporated OLEDs with high external quantum efficiencies(EQEs) of over 20%. Meanwhile, t-CzPXZ allows the solution-processed device with a high EQE of 16.3% with low-efficiency roll-off, attributing to the enhanced molecular solubility and suppressed excitons quenching through tert-butyl modification on t-CzPXZ. The results reveal that the proposed asymmetric structure is a promising approach for developing high-efficiency TADF materials and OLEDs.

关键词: Thermally activated delayed fluorescence, Asymmetric strategy, Organic light-emitting diode, Thermal evaporation, Solution processing

Abstract: Exploring high-efficiency thermally activated delayed fluorescence(TADF) materials is of great importance regarding to organic light-emitting diode(OLED). Herein, we present a design strategy for developing asymmetric TADF materials based on a diphenyl sulfone-phenoxazine structure, resulting in efficient TADF emitters(CzPXZ and t-CzPXZ) with aggregation-induced emission properties, while t-CzPXZ is modified with tert-butyl groups. The two compounds exhibit high solid-state luminescence, efficient TADF, and significantly impressive device performances by both thermal evaporation and solution processing. For an instance, CzPXZ and t-CzPXZ enable the thermally-evaporated OLEDs with high external quantum efficiencies(EQEs) of over 20%. Meanwhile, t-CzPXZ allows the solution-processed device with a high EQE of 16.3% with low-efficiency roll-off, attributing to the enhanced molecular solubility and suppressed excitons quenching through tert-butyl modification on t-CzPXZ. The results reveal that the proposed asymmetric structure is a promising approach for developing high-efficiency TADF materials and OLEDs.

Key words: Thermally activated delayed fluorescence, Asymmetric strategy, Organic light-emitting diode, Thermal evaporation, Solution processing

GAO Shiyuan, CHEN Xiaojie, GE Xiangyu, CHEN Zhu, ZHAO Juan, CHI Zhenguo. Asymmetric Thermally Activated Delayed Fluorescence Materials Rendering High-performance OLEDs Through both Thermal Evaporation and Solution-processing[J]. 高等学校化学研究, 2022, 38(6): 1526-1531.

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Asymmetric Thermally Activated Delayed Fluorescence Materials Rendering High-performance OLEDs Through both Thermal Evaporation and Solution-processing

Asymmetric Thermally Activated Delayed Fluorescence Materials Rendering High-performance OLEDs Through both Thermal Evaporation and Solution-processing

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