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Thermochromic AIE Dual Phosphorescence via Temperature-Dependent sp3-Linked Donor-Acceptor Electronic Coupling

preprint
revised on 08.08.2020 and posted on 10.08.2020 by Tao Wang, Zhubin Hu, Xiancheng Nie, Linkun Huang, Hui Miao, Xiang Sun, Guoqing Zhang

Aggregation-induced emission (AIE) has proven to be a viable strategy to achieve highly efficient RTP in bulk by restricting molecular motions. Here we show that by utilizing triphenylamine (TPA) as an electronic donor which connects to an acceptor via an sp3 linker, six TPA-based AIE-active RTP luminophores were obtained. Both the TPA AIE-gen and the sp3-linkage can suppress aggregation-caused quenching. Consequently, dual phosphorescence bands emitting from localized donor and acceptor triplet states, respectively, could be recorded at lowered temperatures; at room temperature, only a single RTP band corresponding to the lowest triplet state is present, presumably due to thermally assisted electronic coupling between the two states. The reported molecular construct serves as an “intermediary case” between a fully conjugated donor-acceptor system and a do-nor/acceptor binary mix, which may provide important clues on the design and control of molecular systems with complex excited-state dynamics.

Funding

National Key R&D program of China (2017YFA0303500 to G. Z.)

National Natural Science Foundation (GG2340000364 to G. Z.)

National Natural Science Foundation of China (21903054 to X.S.)

History

Email Address of Submitting Author

chemwang@ustc.edu.cn

Institution

University of Science and Technology of China

Country

China

ORCID For Submitting Author

0000-0003-4200-3712

Declaration of Conflict of Interest

There is no conflict of interest to declare

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