稀土纳米荧光粉显现潜指纹研究进展

Research Progress in Rare Earth Nano-fluorescent Powder for Latent Fingerprints Application

稀土纳米荧光粉用于潜指纹可视化,利用了稀土荧光粉发光强度高和纳米粉体与潜指纹具有适宜的附着力特性,显示的潜指纹具有高对比度、高质量和高强度的荧光,特别是上转换纳米荧光粉和长余辉纳米荧光粉显示潜指纹能消除背景干扰,然而用紫外光激发的稀土荧光粉受到基底背景颜色和强背景自发荧光的干扰,在潜指纹显现方面应用具有局限性。本文综述了荧光粉合成方法、形貌、粒度和结构以及各种荧光粉对显示潜指纹特征脊细节级别的影响,特别是继续开发发光强度高、背景干扰小、适应各种基底表面显示潜指纹的稀土纳米荧光粉仍然是一个挑战。

Rare earth nano-fluorescent powders are used for the visualization of latent fingerprint. They take advantages of the high luminescent intensity of rare earth nano-fluorescent powder and the suitable adhesion between nano-fluorescent powder and latent fingerprint. The development of latent fingerprints has high contrast, high quality and high intensity fluorescence. In particular, upconversion phosphors and the long afterglow phosphors for the development of latent fingerprints can eliminate background interference. However, rare earth phosphors excited by ultraviolet light are interfered by the background colors and the strong background autofluorescence, and have limitations in the application in latent fingerprints. In this paper, the synthesis methods, morphology, particle size and structure of phosphors and the effects of various phosphors on the level of ridge details of the latent fingerprint are reviewed. In particular, it is still a challenge to develop rare earth nanophosphors with high luminescence intensity, low background interference and adaptability to display latent fingerprints on various substrates.