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Overcome the Energy Gap Law in Near-Infrared Emissive Aggregates via Nonadiabatic Coupling Suppression

submitted on 28.03.2021, 12:23 and posted on 30.03.2021, 05:13 by Jie Xue, Jingyi Xu, Jiajun Ren, Qingxin Liang, Qi Ou, Rui Wang, Zhigang Shuai, JUAN QIAO

The pursuing of 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. 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.


Email Address of Submitting Author


Tsinghua University


P. R. China

ORCID For Submitting Author


Declaration of Conflict of Interest

The authors declare no competing interests.