Delicate heterocyclic π-extension in MR-TADF emitters: balancing kRISC enhancement and emission narrowing

Jie Li; Zhang-Li Cheng; Shu-Qi Zhang; Yue Wang; Hui Wang; Jie-Yu Zhou; Wen Gao; Ling-Wei Qu; Zhe-Yu Zhu; Jia Yu; Jun Ye; Kai Wang

doi:10.1039/D5CP04299B

Delicate heterocyclic π-extension in MR-TADF emitters: balancing k_RISC enhancement and emission narrowing

Jie Li,†^a Zhang-Li Cheng,†^ab Shu-Qi Zhang,†^b Yue Wang,^a Hui Wang,^b Jie-Yu Zhou,^a Wen Gao,^a Ling-Wei Qu,^a Zhe-Yu Zhu,^a Jia Yu,^b Jun Ye

*^a and Kai Wang

*^bc

Author affiliations

* Corresponding authors

^a School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang, P. R. China
E-mail: yejun@nbu.edu.cn

^b Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu, P. R. China
E-mail: wkai@suda.edu.cn

^c Key Laboratory of Bioinspired Interfacial Materials Science, Soochow University, Suzhou, Jiangsu, P. R. China

Abstract

Herein, a comparative investigation into the π-extension effect on a MR framework was conducted via heteroatom doping engineering. The as-synthesized emitters CzBNNO and CzBNBO both exhibited EQEs > 30%. However, they differ significantly in SRCT/LRCT dominance, which causes distinct discrepancies in spectral broadening and emission peak positions.

Physical Chemistry Chemical Physics

Delicate heterocyclic π-extension in MR-TADF emitters: balancing k_RISC enhancement and emission narrowing

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Delicate heterocyclic π-extension in MR-TADF emitters: balancing k_RISC enhancement and emission narrowing

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