Developing smart materials with tunable high‐temperature afterglow (HTA) luminescence remains a formidable challenge. This study presents a metal‐free doping system using boric acid as matrix and polycyclic aromatic hydrocarbons as dopants. This composition achieves dynamically tunable afterglow combining a bright blue HTA lasting for over ten seconds even at 150°C and an ultra‐long yellow room‐temperature phosphorescence below 110°C. The observed HTA is attributed to the thermally released exciton recombination within the dopant molecules, which shows excellent temperature tolerance compared to traditional triplet related phosphorescence and thermally activated delayed fluorescence. The planarity of dopants is extensively investigated playing a pivotal role in modulating Dexter electron transfer (ET) for capturing released electrons and thereby affecting the overall performance of tunable HTA. This work provides an efficient and universal doping strategy to engineer tunable HTA through the synergistic action of thermally releasing electrons, Dexter ET and exciton recombination.

中文翻译：

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高温超长余辉激子复合的热调制


开发具有可调高温余辉 （HTA） 发光的智能材料仍然是一项艰巨的挑战。本研究提出了一种以硼酸为基质，以多环芳烃为掺杂剂的无金属掺杂系统。这种组合物实现了动态可调的余辉，结合了即使在 150°C 下也能持续 10 秒以上的亮蓝色 HTA 和低于 110°C 的超长黄色室温磷光。 观察到的 HTA 归因于掺杂剂分子内热释放的激子复合，与传统的三重态相关磷光和热激活延迟荧光相比，它表现出优异的耐温性。掺杂剂的平面性被广泛研究，在调节 Dexter 电子转移 （ET） 以捕获释放的电子，从而影响可调谐 HTA 的整体性能方面起着关键作用。这项工作提供了一种高效且通用的掺杂策略，通过热释放电子、Dexter ET 和激子复合的协同作用来设计可调 HTA。