Afterglow materials have the advantages of long luminescent lifetime and large stokes shift, which show good application prospects in fields such as probes, anti‐counterfeiting, and organic light‐emitting diode (OLED). Nevertheless, the preparation of multicolor long afterglow materials with simple components remains a challenge. This article proposes a general strategy for preparing room temperature long‐lifetime fluorescent polymer materials. This strategy involves doping various fluorescent small molecules containing electron‐donating groups into polymers containing electron‐withdrawing groups. The results show the two components can form charge‐separated state by long‐range charge transfer, and the excitons recombined in fluorescent molecules and emitted long‐lived fluorescence. After photoactivation, the P3COMe film doped with 1% RhB can emit red fluorescent afterglow. The lifetime can achieve 39.4 ms, and the afterglow can last 4.17 s. Meanwhile, by introducing fluorescent molecules with different luminescent colors, the multicolor long‐lifetime fluorescence is also realized. In addition, the influence of the structure of luminescent small molecules on the afterglow fluorescent properties of their doped films is also elucidated.

中文翻译：

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基于电荷分离态的多色长寿命荧光材料的设计与制备

余辉材料具有发光寿命长、斯托克斯位移大等优点，在探针、防伪、有机发光二极管（OLED）等领域显示出良好的应用前景。然而，用简单成分制备多色长余辉材料仍然是一个挑战。本文提出了制备室温长寿命荧光聚合物材料的总体策略。该策略涉及将各种含有给电子基团的荧光小分子掺杂到含有吸电子基团的聚合物中。结果表明，两种组分可以通过长程电荷转移形成电荷分离态，激子在荧光分子中重新结合并发出长寿命的荧光。掺杂1%RhB的P3COMe薄膜经光活化后可发出红色荧光余辉。寿命可达39.4 ms，余辉可持续4.17 s。同时，通过引入不同发光颜色的荧光分子，还实现了多色长寿命荧光。此外，还阐明了发光小分子的结构对其掺杂薄膜的余辉荧光性能的影响。