上转换发光材料在不同防伪领域的研究进展Q

稀土上转换纳米粒子(UCNPs)能够吸收低能量的近红外光并转换为高能量的紫外或可见光,具有自体发光背景低、发光颜色可调、荧光寿命长和光稳定性好等优异的光学性能,还具有可加工性高、表面功能化便捷等特点,已成为荧光防伪技术的研究前沿和研究热点,应用前景广泛.该文综述了UCNPs的发光机制和制备方法,阐述了近年来其在标签、图案、编码等荧光防伪领域应用的相关研究成果.进一步地探讨了UCNPs在荧光防伪领域应用上所存在的问题和面临的挑战,提出了未来可能的发展方向.

Research progress of upconversion luminescent materials in different anti-counterfeiting fields

Rare-earth upconversion nanoparticles (UCNPs), which can absorb low-energy near-infrared light and convert it into high-energy ultraviolet or visible light, and have excellent optics of low self-luminescence background, adjustable luminescence color, long fluorescence lifetime and good light stability. In addition, they also have the characteristics of high processability and convenient surface functionalization. Therefore, UCNPs have become the research frontier and hotspot of fluorescent anti-counterfeiting technology, and the application prospects are very wide. In this review, luminescent mechanisms of UCNPs, the advantages and disadvantages of a series of preparation methods are analyzed, as well as elaborate the relevant excellent research achievements in recent years in the field of fluorescent anti-counterfeiting such as labels, patterns, and encoding. Furthermore, the problems and challenges in the application of UCNPs in fluorescent anti-counterfeiting are discussed, and also propose the possible development directions in the future.