镧系元素掺杂的上转换纳米带结构的可控制备及其在防伪中的应用研究

Presently many corporations and enterprises have paid much attention to the anti-counterfeiting of their merchandise, bills and certificates. An anti-counterfeiting material is the cornerstone of anti-counterfeiting technology, and luminescent material is a big branch of anti-counterfeiting materials. Rare earth-doped up-conversion nano luminescence material is the perfectly invisible anti-fake material with controllable microstructure. Besides, it can been stimulated to generate variety of colors of light through a particular wavelength infrared light. Based on these special materials, the manufactural anti-counterfeiting inks have many advantages, such as high technology content, simple recognition, good anti-counterfeit effect. The purpose of this project is realizing the application of up-conversion fluorescent materials in the field of security, for one thing, a series of work will be carried out in order to synthesize the efficient up-conversion fluorescent materials which have nanobelts structure, for another, detailed analysis about growth mechanism of materials, conversion luminescence rule and mechanism will be made. In the meantime, based on the deep analysis of growth mechanism and spectral characteristic, the anti-counterfeiting potential and new technical scheme of up-conversion fluorescent materials should be developed for the further improvement of anti-counterfeiting power and level.

当前各种商品、票据、证券等的防伪受到企事业单位的高度重视。防伪技术离不开防伪材料，而防伪材料中的一个很大分支是发光材料。稀土上转换纳米发光材料可被特定波长红外光激发、发光颜色丰富、微观形貌可控，是理想的隐形防伪材料。基于此材料开发的防伪油墨、防伪墨粉等新型防伪产品科技含量高、识别简单、防伪力度强、极难破解和仿造。本课题围绕上转换荧光材料在防伪领域的应用，拟开展了一系列具有纳米带结构的高效上转换材料的制备工作，详细分析材料生长机理上转换发光规律与机理。与此同时，在深入分析上转换材料的生长规律和光谱特性的基础上，发掘上转换材料的防伪潜能，发展新型上转换防伪技术方案，以此来增强防伪力度，提高防伪等级。

稀土掺杂上转换纳米颗粒形貌、激发光谱和发射光谱的有效调控使其在光学防伪、单颗粒检测、信息存储和编码领域有着广泛应用。本项目采用共沉淀法和水热合成方法，在XRD、SEM、TEM和PL等表征技术的支撑下，成功实现了稀土掺杂纳米颗粒结构的形貌和组成调控。随后，通过纳米颗粒结构的设计，完成了纳米晶材料发光效率、发光颜色、激发波长和发光离子寿命方面的调控。在此基础上，利用优化上转换纳米晶材料的发光效率、发光颜色、激发波长和发光离子寿命等参数，实现了它们在光学防伪检测、单颗粒检测、信息存储和编码等领域的应用。相关研究成果对稀土纳米颗粒的制备及其光学与应用技术的发展具有积极的推动作用，也将有助于奠定研发多功能高效稀土上转换纳米材料的基础，具有较高的理论研究和实际应用价值。为新进入该领域的科研人员提供了一个快速通道，能使其对稀土掺杂无机材料的制备与发光机理有初步理解，为后期的科研工作提供坚实的理论基础。