Significantly Enhanced Afterglow Brightness via Intramolecular Energy Transfer

Afterglow materials with long-lived emission after ceasing the excitation source have exhibited tremendous potential for various applications. However, the inherently dim afterglow emission makes it a bottleneck for wider applications. Herein, we present an intramolecular energy transfer strategy for enhancing the afterglow brightness by covalently coupling of afterglow substrate unit and afterglow emitter unit. Compared to the conventional intermolecular energy transfer system, the afterglow intensity of our developed system based on intramolecular energy transfer shows an over 100-fold enhancement. Furthermore, we demonstrate the generality of this strategy for improving afterglow brightness, which is applicable to different afterglow materials including green, yellow, and red emissions. We believe that this strategy to enhance afterglow intensity will provide a major step forward for developing afterglow luminescent materials with high brightness.余辉（Afterglow）材料——即在激发源终止作用后仍可维持长寿命发光的材料——在诸多应用领域展现出巨大潜力。然而，余辉发光本征亮度偏低的问题，成为制约其更广泛应用的核心瓶颈。有鉴于此，本研究提出了一种通过共价偶联余辉基质单元与余辉发光单元，借助分子内能量转移（intramolecular energy transfer）策略提升余辉亮度的方法。相较于传统的分子间能量转移体系，本研究基于分子内能量转移构建的体系，其余辉发光强度提升幅度超过100倍。此外，本研究还证实了该策略在提升余辉亮度方面的普适性，可应用于绿光、黄光及红光发射等多种不同类型的余辉材料。我们认为，这一强化余辉发光强度的策略，将为高亮度余辉发光材料的开发迈出关键一步。