Citation: Kuofei Li, Tao Wang, Bing Yao, Yuannan Chen, Hao Deng, Hongmei Zhan, Zhiyuan Xie, Yanxiang Cheng. Carbazole ring: A delicate rack for constructing thermally activated delayed fluorescent compounds with through-space charge transfer[J]. Chinese Chemical Letters, ;2021, 32(12): 4011-4014. doi: 10.1016/j.cclet.2021.05.054 shu

Carbazole ring: A delicate rack for constructing thermally activated delayed fluorescent compounds with through-space charge transfer

Kuofei Li ^{a, b} ,
Tao Wang ^a ,
Bing Yao ^a ,
Yuannan Chen ^a ,
Hao Deng ^{a, b} ,
Hongmei Zhan ^{a, *,} ,
Zhiyuan Xie ^a ,
Yanxiang Cheng ^{a, b, *,}

a.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
b.
School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China

hmzhan@ciac.ac.cn

yanxiang@ciac.ac.cn

Received Date: 7 February 2021
Revised Date: 23 May 2021
Accepted Date: 24 May 2021
Available Online: 31 May 2021

Figures(4)

Three carbazole derivatives, AcPTC, PxPTC and PtPTC, consisting of two 9,9-dimethyl-9,10-dihydroacridine, phenoxazine or phenothiazine donor groups and one diphenyltriazine acceptor group fixed at 1,8,9-positions of a single carbazole ring via phenylene, are designed and synthesized. X-ray diffraction analysis of AcPTC reveals that there exist multiple π-π interactions between the donor and acceptor groups to form a sandwich-like structural unit with edge-to-face interaction model. The compounds thus show obvious thermally activated delayed fluorescence with through-space charge transfer character and possess considerable photoluminescence quantum yields of up to 73% in doped films with sky-blue to yellow emissions. The solution-processed electroluminescent devices achieve the highest maximum external quantum efficiencies of 10.0%, 11% and 5.6% for AcPTC, PxPTC and PtPTC, respectively, with small efficiency roll-offs.
- Thermally activated delayed fluorescence,
- Through-space charge transfer,
- Carbazole,
- Solution-processed devices,
- Sky-blue emission
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