Abstract
Pursuing purely organic materials with high-efficiency near-infrared (NIR) emissions is fundamentally limited by the large non-radiative decay rates (knr) governed by the energy gap law. To date, reported endeavors to decelerate knr are mainly focused on reducing the electron-vibration coupling with the electronic nonadiabatic coupling assumed as a constant. Here, we demonstrated a feasible and innovative strategy by employing intermolecular charge-transfer (CT) aggregates (CTA) to realize high-efficiency NIR emissions via nonadiabatic coupling suppression. The formation of CTA engenders intermolecular CT in the excited states; thereby, not only reducing the electronic nonadiabatic coupling and contributing to small knr for high-efficiency NIR photoluminescence, but also stabilizing excited-state energies and achieving thermally activated delayed fluorescence for high-efficiency NIR electroluminescence. This work provides new insights into aggregates and opens a new avenue for organic materials to overcome the energy gap law and achieve high-efficiency NIR emissions.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (51773109, 21788102), National Key R&D Program of China (2020YFA0715001, 2017YFA0204501), National Postdoctoral Program for Innovative Talents (BX20180159), and the Project funded by China Postdoctoral Science Foundation (2019M660606). Research presented in this article was posted on a preprint server prior to publication in Science China Chemistry. The corresponding preprint article can be found here: https://doi.org/10.26434/chemrxiv.14330591.v1.
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Xue, J., Xu, J., Ren, J. et al. Intermolecular charge-transfer aggregates enable high-efficiency near-infrared emissions by nonadiabatic coupling suppression. Sci. China Chem. 64, 1786–1795 (2021). https://doi.org/10.1007/s11426-021-1096-8
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DOI: https://doi.org/10.1007/s11426-021-1096-8