Single‐component multicolor luminescence, particularly phosphorescence materials are highly attractive both in numerous applications and in‐depth understanding the light‐emission processes, but formidable challenges still exist for preparing such materials. Herein, a very facile approach is reported to synthesize carbon dots (CDs) (named MP‐CDs) that exhibit multicolor fluorescence (FL), and more remarkably, multicolor long‐lived room temperature phosphorescence (RTP) under ambient conditions. The FL and RTP colors of the CDs powder are observed to change from blue to green and cyan to yellow, respectively, with the excitation wavelength shifting from 254 to 420 nm. Further studies demonstrate that the multicolor emissions can be attributed to the existence of multiple emitting centers in the CDs and the relatively higher reaction temperature plays a critical role for achieving RTP. Given the unique optical properties, a preliminary application of MP‐CDs in advanced anti‐counterfeiting is presented. This study not only proposes a strategy to prepare photo‐stimulated multicolor RTP materials, but also reveals great potentials of CDs in exploiting novel optical materials with unique properties.

中文翻译：

---

碳点的光激发多色室温磷光。

单组分多色发光，尤其是磷光材料在众多应用和深入了解发光过程中都具有很高的吸引力，但是在制备这种材料方面仍然存在着巨大的挑战。本文报道了一种非常简便的方法来合成在环境条件下表现出多色荧光（FL），更显着的是多色长寿命室温磷光（RTP）的碳点（CD）（称为MP-CD）。观察到CD粉末的FL和RTP颜色分别从蓝色变为绿色，从青色变为黄色，激发波长从254 nm转变为420 nm。进一步的研究表明，多色发射可以归因于CD中多个发射中心的存在，并且相对较高的反应温度对于实现RTP至关重要。鉴于其独特的光学性能，介绍了MP-CD在高级防伪中的初步应用。这项研究不仅提出了制备光刺激的多色RTP材料的策略，而且还揭示了CD在开发具有独特性能的新型光学材料方面的巨大潜力。