硅酸盐荧光粉显现潜在指纹的应用研究  

Application of Silicate Phosphors to Display Latent Print

作　　者：谢安[1] 郑凯鹏 吴昊[1] 李金涛[1] 

机构地区：[1]厦门理工学院材料科学与工程学院,福建厦门361024

出　　处：《中国稀土学报》2014年第6期650-656,共7页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金(11204258);福建省自然科学基金杰出青年(2012J06024);福建省高校杰出青年科研人才培育计划(JA13329);教育部人文社科基金项目(11YJC820135);福建省高等学校新世纪优秀人才支持计划项目(ZA14228)资助

摘　　要：指纹的法医鉴定被广泛用于犯罪的人身认定,已成为基础的法庭证据。随着稀土荧光粉的快速发展,使检验和鉴定潜在指纹成为了可能。采用高温固相法合成了用于显现潜在指纹的Ba2-xSi O4:Eu2+x荧光粉,测量了在1300℃下保温3 h时样品的激发和发射光谱,研究了不同Ba2+和Eu2+浓度荧光粉的荧光光谱性质。用X射线衍射分析荧光粉在不同浓度的物相,确定还原气氛中Ba2-xSi O4:Eu2+x荧光粉的最佳合成浓度为x=0.08,可得到较好发光性能的硅酸盐荧光粉。重点讨论了对荧光粉粒径大小的优化、粉体的无机后处理和粉体表面有机修饰等性能优化,使其能用于显现清晰的潜在指纹。Fingerprint in forensic identification is widely used for confirming criminals, as the basis of forensic evi- dence. With the development of rare-earth phosphors, it is possible to detect and identify potential fingerprints. By using high-temperature solid state reaction method in a reducing atmosphere, Ba2_xSiO4 ：Eu2x＋ phosphors used for latent fingerprints were synthesized. The photoluminescence excitation and emission spectra of the samples synthe- sized at 1300℃ for 3 h with different concentrations of Ba and Eu2＋ were measured and studied. X-ray diffraction was used to analyze the structure phase of phosphors with different concentrations of Eu2＋ . The results suggest that the optimum x is 0.08 in Ba2_xS1O4 ：Eu2＋x phosphors for the silicate phosphor Ba1.2aSiO4：Eu2＋/0.8 having the strongest luminescent intensity. The effects and optimization of particle size, inorganic dealing, and surface organic modifica- tion of the phosphors were discussed in detail, which could make the phosphors applicable for displaying clear po- tential fingerprints.

关 键 词：硅酸盐 潜在指纹 荧光粉 稀土 

分 类 号：TN104.3[电子电信—物理电子学]