Citation: Zhihua Ma, Yuchun Wan, Wenyue Dong, Zhenjun Si, Qian Duan, Shiyang Shao. Alkoxy encapsulation of carbazole-based thermally activated delayed fluorescent dendrimers for highly efficient solution-processed organic light-emitting diodes[J]. Chinese Chemical Letters, ;2021, 32(2): 703-707. doi: 10.1016/j.cclet.2020.06.025 shu

Alkoxy encapsulation of carbazole-based thermally activated delayed fluorescent dendrimers for highly efficient solution-processed organic light-emitting diodes

Zhihua Ma ^a ,
Yuchun Wan ^a ,
Wenyue Dong ^a ,
Zhenjun Si ^{a, *,} ,
Qian Duan ^a ,
Shiyang Shao ^{b, *,}

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

szj@cust.edu.cn

ssyang@ciac.ac.cn

Received Date: 3 May 2020
Revised Date: 28 May 2020
Accepted Date: 19 June 2020
Available Online: 20 June 2020

Figures(4)

Two n-butoxy-encapsulated dendritic thermally activated delayed fluorescent (TADF) emitters (namely O-D1 and O-D2) with the first-/second-generation carbazoledendrons are designed and synthesized via CN coupling between carbazoledendrons and 2,4,6-tris(4-bromophenyl)-1,3,5-triazine core. It is found that, compared with the commonly-used tert-butyl groups, the use of n-butoxy encapsulation groups can lead to smallersinglet-triplet energy gap for the dendrimers, producing stronger TADF effect together with faster reverse intersystem crossing process. Solution-processed TADF organic light-emitting diodes (OLEDs) utilizingalkoxy-encapsulated dendrimers O-D1 and O-D2 as emitters exhibitstate-of-the-art device efficiency withthe maximum external quantum efficiency up to 16.8% and 20.6%, respectively, which are ~1.6 and ~2.0 times that of the tert-butyl-encapsulated counterparts. These results suggest that alkoxy encapsulation of the carbazole-based TADF dendrimers can be a promising approach for developing highly efficient emitters for solution-processed OLEDs.
- Alkoxy encapsulation,
- Thermally activated delayed fluorescence,
- Dendrimer,
- Organic light-emitting diodes
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