Nido‐Carboranes: Donors for Thermally Activated Delayed Fluorescence |
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| Authors: | Dr. Nguyen Van Nghia Dr. Saibal Jana Surendran Sujith Ji Yeon Ryu Prof. Junseong Lee Prof. Sang Uck Lee Prof. Min Hyung Lee |
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| Affiliation: | 1. Department of Chemistry and EHSRC, University of Ulsan, Ulsan, Republic of Korea;2. Department of Bionano Technology, Department of Chemical and Molecular Engineering, Hanyang University, Ansan, Republic of Korea;3. Department of Chemistry, Chonnam National University, Gwangju, Republic of Korea |
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| Abstract: | An approach to the design of nido‐carborane‐based luminescent compounds that can exhibit thermally activated delayed fluorescence (TADF) is proposed. 7,8‐Dicarba‐nido‐undecaboranes (nido‐carboranes) having various 8‐R groups (R=H, Me, i‐Pr, Ph) are appended to the meta or para position of the phenyl ring of the dimesitylphenylborane (PhBMes2) acceptor, forming donor–acceptor compounds (nido‐ m1 – m4 and nido‐ p1 – p4 ). The bulky 8‐R group and meta substitution of the nido‐carborane are essential to attain a highly twisted arrangement between the donor and acceptor moieties, leading to a very small energy splitting between the singlet and triplet excited states (ΔEST <0.05 eV for nido‐ m2 , ‐ m3 , and ‐ p3 ). These compounds exhibit efficient TADF with microsecond‐range lifetimes. In particular, nido‐ m2 and ‐ m3 display aggregation‐induced emission (AIE) with TADF properties. |
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| Keywords: | AIE donor– acceptor systems nido-carborane thermally activated delayed fluorescence triarylborane |
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