With the combination of carbon quantum dots (CDs) and rare earth-doped fluorescent materials, multi-mode luminescence can be achieved in fluorescent ink, thereby enhancing its anti-counterfeiting security coefficient. However, the self-quenching process in CDs currently hinders their application in the field of anti-counterfeiting. In this study, we employed simple chemical method to prepare the SiO₂-encapsulated YVO₄:Eu³⁺/CDs nanocomposites, which greatly improved the stability of the composite and achieved dual-mode solid-state luminescence. Quick response code anti-counterfeiting patterns were fabricated using screen printing technology, and dual-mode luminescence performance with red and blue emission was achieved under excitation at 254 nm and 365 nm respectively. The YVO₄:Eu³⁺@SiO₂@CDs nanocomposites showed stable dual-mode luminescent performance in both solid-state and solvent environment, demonstrating great potential in anticounterfeiting and information protection application.

中文翻译：

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YVO4： Eu3+@SiO2@CDs 纳米复合材料的双模发光和防伪应用


通过将碳量子点 （CD） 与稀土掺杂荧光材料相结合，可以在荧光墨水中实现多模式发光，从而提高其防伪安全系数。然而，CD 中的自淬火过程目前阻碍了它们在防伪领域的应用。本研究采用简单的化学方法制备了 SiO₂ 封装的 YVO₄：Eu³⁺/CDs 纳米复合材料，大大提高了复合材料的稳定性，实现了双模固态发光。采用丝网印刷技术制备了快速响应码防伪图案，在 254nm 和 365nm 激发下分别实现了红蓝双模发光性能。YVO₄：Eu³⁺@SiO₂@CDs 纳米复合材料在固态和溶剂环境中均表现出稳定的双模发光性能，在防伪和信息保护应用中表现出巨大潜力。