Citation: Jingfeng Liu, Ziqi Feng, Chenchen Peng, Youjun Yu, Shengyi Yang, Zuoquan Jiang, Liangsheng Liao. Acceptor modulation for improving thermally activated delayed fluorescence emitter in through-space charge transfer on spiroskeletons[J]. Chinese Chemical Letters, ;2023, 34(6): 107634. doi: 10.1016/j.cclet.2022.06.057 shu

Acceptor modulation for improving thermally activated delayed fluorescence emitter in through-space charge transfer on spiroskeletons

Jingfeng Liu ^{a, 1} ,
Ziqi Feng ^{a, 1} ,
Chenchen Peng ^a ,
Youjun Yu ^a ,
Shengyi Yang ^a ,
Zuoquan Jiang ^{a, *,} ,
Liangsheng Liao ^{a, b, *,}

a.
Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, China
b.
Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, Taipa 999078, Macau SAR, China

zqjiang@suda.edu.cn

lsliao@suda.edu.cn

Received Date: 26 April 2022
Revised Date: 3 June 2022
Accepted Date: 21 June 2022
Available Online: 26 June 2022

Figures(4)

Through-space charge transfer (TSCT) is regarded as an effective way to develop thermally activated delayed fluorescence (TADF) emitters. Based on this strategy, many molecular frameworks have been proposed, among which spirobased scaffolds have been extensively studied due to their unique advantages. In this work, we developed three emitters SPS, SPO, and SPON, which were constructed with the same donor and various acceptors to explore the influence of acceptor modulation at the C9 position of fluorene for spirostructure TSCT emitters. The results show that the acceptor with too weak electron-withdrawing ability will cause the emitter to not have TADF properties, while the acceptor with too much steric hindrance will weaken the face-to-face π-π stacking interaction between donor/acceptor (D/A). Since SPO balances the electron-withdrawing strength and steric hindrance of the acceptor, it achieves the highest external quantum efficiency (EQE) of 17.75%. This work shows that appropriate acceptor selection is essential for the TADF properties and high efficiency of the spirobased scaffold TSCT emitter
- Thermally activated delayed fluorescence,
- Organic light-emitting diodes,
- Through-space charge transfer,
- Acceptor modulation,
- Spiro skeleton
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