Carbon dots (CDs) with aggregation-induced emission (AIE) have sparked significant interest in multidimensional anti-counterfeiting due to their exceptional fluorescence properties. However, the preparation of AIE CDs with multicolor solid-state fluorescence remains a formidable challenge due to its complicated construction. In the present work, a novel class of multicolor AIE CDs (M-CDs) were fabricated using selected precursor (salicylic acid, thiosalicylic acid, and 2,2′-dithiodibenzoic acid), with an eco-friendly, low-cost one-pot solvothermal method. In the dilute organic solution, M-CDs manifested blue emission, but upon aggregation in the presence of water, the red, yellow, green, and blue emissions were displayed due to the AIE effect. Structural analysis, coupled with theoretical calculations, revealed that the increase in the size of sp² domains would lower the E_g and cause a red-shift emission wavelength. Significantly, the continuous emission of M-CDs from blue to red can be utilized as ink for multimode printing, enabling the creation of a variety of school badges and quick response codes. These findings hold promising implications for multi-information encryption applications.

具有聚集诱导发射（AIE）功能的碳点（CD）由于其特殊的荧光特性，引起了多维防伪的极大兴趣。然而，由于其复杂的结构，制备具有多色固态荧光的 AIE CD 仍然是一个艰巨的挑战。在目前的工作中，使用选定的前体（水杨酸、硫代水杨酸和2,2'-二硫代二苯甲酸）制备了一类新型的多色AIE CD（M-CD），并具有环保、低成本的单-锅式溶剂热法。在稀有机溶液中，M-CDs 表现出蓝色发射，但在水存在下聚集时，由于 AIE 效应而显示出红色、黄色、绿色和蓝色发射。^{结构分析结合理论计算表明，sp 2}域尺寸的增加会降低E _g并导致发射波长红移。值得注意的是，M-CD 从蓝色到红色的连续发射可以用作多模式打印的墨水，从而能够创建各种学校徽章和快速响应代码。这些发现对多信息加密应用具有广阔的前景。