Ultralong organic phosphorescence (UOP) materials have roused considerable attention in the field of photonics and optoelectronics owing to the feature of long-lived emission lifetimes. However, to develop UOP materials with color-tunability is still a formidable challenge. Here, we report a class of UOP materials containing carbonyl, amino or amide groups, exhibiting colortunable persistent luminescence ranging from blue (458 nm) to yellow-green (508 nm) under different UV wavelength excitation. Taken theoretical and experimental results together, we conclude that the excitation dependent color-tunable UOP emission is ascribed to multiple emission centers from single molecular and aggregated states in crystal. Given color-tunable UOP feature, these materials are used to successfully realize visual UV-light detection. This finding not only provides a strategy to design new organic phosphorescent molecules with colorful emission, but also extends the scope of the applications of purely organic phosphorescent materials.

由于具有长寿命的发射寿命，超长有机磷光（UOP）材料在光子学和光电子学领域引起了广泛的关注。然而，开发具有颜色可调性的UOP材料仍然是一个巨大的挑战。在这里，我们报告了一类含有羰基，氨基或酰胺基团的UOP材料，在不同的紫外线波长激发下，它们呈现出可调谐的持续发光，范围从蓝色（458 nm）到黄绿色（508 nm）。综合理论和实验结果，我们得出结论：与激发有关的颜色可调UOP发射归因于晶体中单个分子和聚集态的多个发射中心。有了颜色可调的UOP功能，这些材料就可以成功地实现视觉紫外线检测。