Citation: Ming Zhang, Gaole Dai, Caijun Zheng, Kai Wang, Yizhong Shi, Xiaochun Fan, Hui Lin, Silu Tao, Xiaohong Zhang. New electron-donating segment to develop thermally activated delayed fluorescence emitters for efficient solution-processed non-doped organic light-emitting diodes[J]. Chinese Chemical Letters, ;2022, 33(2): 1110-1115. doi: 10.1016/j.cclet.2021.08.064 shu

New electron-donating segment to develop thermally activated delayed fluorescence emitters for efficient solution-processed non-doped organic light-emitting diodes

Ming Zhang ^{a, b} ,
Gaole Dai ^b ,
Caijun Zheng ^{a, *,} ,
Kai Wang ^b ,
Yizhong Shi ^b ,
Xiaochun Fan ^b ,
Hui Lin ^a ,
Silu Tao ^a ,
Xiaohong Zhang ^{b, *,}

a.
School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China
b.
Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China

zhengcaijun@uestc.edu.cn

xiaohong_zhang@suda.edu.cn

Received Date: 5 July 2021
Revised Date: 30 July 2021
Accepted Date: 12 August 2021
Available Online: 18 August 2021

Figures(5)

Thermally activated delayed fluorescent (TADF) materials capable of efficient solution-processed non-doped organic light-emitting diodes (OLEDs) are of important and practical significance for further development of OLEDs. In this work, a new electron-donating segment, 2,7-di(9H-carbazol-9-yl)-9,9-dimethyl-9,10-dihydroacridine (2Cz-DMAC), was designed to develop solution-processable non-doped TADF emitters. 2Cz-DMAC can not only simultaneously increase the solubility of compounds and suppress harmful aggregation-caused quenching, but also efficiently broaden the delocalization of the highest occupied molecular orbital and promote the reverse intersystem crossing process. Three new TADF emitters, 2-(2,7-di(9H-carbazol-9-yl)-9,9-dimethylacridin-10(9H)-yl)dibenzo[b, d]thiophene 5,5-dioxide (2Cz-DMAC-BTB), 2-(2,7-di(9H-carbazol-9-yl)-9,9-dimethylacridin-10(9H)-yl)-9H-thioxanthen-9-one (2Cz-DMAC-TXO), 2-(2,7-di(9H-carbazol-9-yl)-9,9-dimethylacridin-10(9H)-yl)thianthrene 5,5,10,10-tetraoxide (2Cz-DMAC-TTR), were developed by using 2Cz-DMAC segment as the electron-donor. As anticipated, the solution-processed non-doped OLEDs employing 2Cz-DMAC-BTB, 2Cz-DMAC-TXO and 2Cz-DMAC-TTR as the emitters respectively exhibited green, orange and red emissions with maximum external quantum efficiencies of 14.0%, 6.6% and 2.9%. These results successfully demonstrate the feasibility and convenience of developing efficient solution-processable non-doped TADF emitters based on 2Cz-DMAC segment.
- Electron-donating segment,
- Thermally activated delayed fluorescence,
- Solution process,
- Non-doped emitter,
- Organic light-emitting diode
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