斯托克斯白光转换材料的可控合成及转光薄膜的潜指纹显现识别功能化

It has great scientific significance and practical value of the high definition visualization and detection of latent fingerprint, especially in crime investigation. Stokes luminescence refers the process of higher-energy ultraviolet light, "down-converted" to become lower energy visible with special materials. The apatite or garnet structure alkaline earth silicates, aluminates, phosphates and borates, or complex oxysalts are adopted as host materials, Stokes UV-white light conversion phosphors, with single or double host materials doped with single or multi rare-earth ion activators, are designed and synthesized. To improve the quantum efficiency of the light-emitting materials, the host composition, crystal structure, and energy transfer process between rare earth activators will be adjusted and optimized. The color coordinate of materials can be controllable in a wide range. With our improved multi-source vacuum heat evaporation and multi target electron beam evaporation system, the Stokes white-light conversion phosphors are to be deposited onto quartz sheets, thus ultraviolet light-white conversion neat films with high efficiency are acquired. By means of assembling with CCD and CMOS of the digital camera, it can be realized the direct, rapid visualization, detection and register with high definition of latent fingerprint. Being irradiated by ultraviolet light, high definition pictures of latent fingerprint on any object can be obtained. This work can bring out the luminescence kinetics process of the film materials. And the imaging technique is a breakthrough in visualization of the latent fingerprint on different objects, which meets the urgent need of crime investigation.

潜指纹的高清晰显现识别的科学意义与实用价值，在刑侦破案过程不言而喻。斯托克斯发光是把紫外光等较高能量的光“下转换”成为较低能量的可见光的过程。以磷灰石结构或石榴石结构的碱土金属硅酸盐、铝酸盐、磷酸盐、硼酸盐或复合含氧酸盐等为基质，设计合成单基质和双基质，单掺或多掺杂稀土激活剂的紫外光-白光转换发光材料。通过基质组成与晶体结构调变、稀土激活剂之间的能量传递效应，提高发光材料的量子效率，在较宽范围内可控调配发光颜色，实现高品质白光输出。采用多源真空热蒸发系统、多靶位电子束蒸发系统和磁控溅射制膜系统等装置，将发光材料沉积在石英基片上，以获得组分均匀、表面平整、高发光效率的紫外光-白光转光薄膜。通过与数码相机CCD或CMOS配装，实现对遗留在各种客体上的潜指纹在紫外光照射下，直接、快速、高清晰显现识别。本课题的实施与完成可以解决多变或特殊客体潜指纹难以显现识别的技术难题，满足公安刑侦的实用需求。

潜指纹的高清晰显现识别在刑侦破案过程有重要的作用。斯托克斯发光是把紫外光等较高能量的光“下转换”成为较低能量的可见光的过程。采用前驱体-高温固相法、溶胶凝胶法、水热合成法、溶胶-发泡燃烧法和均相共沉淀-发泡燃烧法，合成了磷酸盐、硅酸盐、钨酸盐、铌酸盐、钽酸盐、钛酸盐和钼酸盐等单基质，氟磷酸盐双基质等体系的紫外光-白光转光薄膜用发光材料33种，其中单基质单发光中心或多发光中心转光薄膜用发光材料7大类26种；双基质单发光中心或多发光中心转光薄膜用发光材料7种。通过基质组成与晶体结构调变、稀土激活剂之间的能量传递效应，提高了发光材料的量子效率， 在较宽范围内可控调配发光颜色，其中多种紫外光-白色或近白色发光材料的色度坐标位于或接近x=0.31~0.33，y=0.33~0.34，发光强度高，满足潜指纹显现要求。.选择部分可将紫外光“下转换”成为白光或近白光的发光材料，利用脉冲激光沉积制膜系统、溶胶凝胶旋涂-焙烧法等制备方法，将发光材料沉积在石英基片上，获得了组分均匀、表面平整、高发光效率的紫外光-白光转光薄膜。满足潜指纹显现要求。.通过转光薄膜与数码相机CMOS配装，实现了对遗留在不同载体上的潜指纹在紫外光照射下，直接、快速、高清晰显现识别，可以实现多种载体上潜指纹显现识别，满足公安刑侦的实用需求。.发表研究论文28篇，其中SCIE收录18篇，EI收录10篇；申报中国发明专利4项；获黑龙江省科学技术三等奖1项；参加学术会议2场8人次；培养研究生10名；项目组1名成员晋升教授。