相和尺寸控制合成稀土离子掺杂的复合氟化物纳米材料及其上转换发光性质研究

项目名称： 相和尺寸控制合成稀土离子掺杂的复合氟化物纳米材料及其上转换发光性质研究

项目编号： No.21261016

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 德格吉呼

作者单位： 内蒙古师范大学

项目金额： 50万元

中文摘要： 复合氟化物是一类重要的上转换发光基质材料。它们具有从可见光-红外光范围内透光率高、声子能量低、机械性能好、折射率在很宽的温度范围内变化不大和吸水性小等特点。然而，当稀土掺杂复合氟化物材料的空间尺寸减小到纳米量级时，晶体中原子排列方式发生改变，从而它们的比表面积、表面吸附性能和物相发生变化而导致其光物理性质发生变化。人们已经开始研究稀土掺杂复合氟化物纳米材料表面效应和相变现象。迄今为止，未见系统研究引起稀土掺杂复合氟化物的相、尺寸及表面效应与光学性质的文献报道，更没出现材料相变对器件开发研究方面的文献报道。稀土离子掺杂复合氟化物纳米材料的表面效应和物相、尺寸控机制是纳米器件研究的首要解决的基本问题。本项目拟采用微乳和溶剂热结合技术制备相、尺寸可控的稀土掺杂复合氟化物纳米材料，研究其相变、小尺寸效应及表面效应对其上转换发光性质的影响。为开发性能优良、环境友好的生物病毒检测和光通讯器材奠定基础。

中文关键词： 稀土；复合氟化物；纳米材料；控制合成；上转换发光

英文摘要： Complex fluoride is an important kind of upconversion (UC) host material, for it has high transmission in the visible-infrared range, low phonon energy, good mechanical properties, small variation of refraction index in a wide range of temperature, low hygroscopicity, etc. When the sizes of rare earth doped complex fluorides decrease to nanometer level, the arrangements of atoms in the system will change, which results in change of the specific surface area, surface adsorption properties and crystalline phase. Correspondingly, the optical properties of the complex fluorides will change, too. Researchers have begun exploring the surface effects and phase transitions of rare earth doped complex fluorides. To the best of our knowledge, there is no systematically report on factors of phase transition, sizes and surface of rare earth doped complex fluorides as well as the phase transition effects, small sizes effects, and surface effects on the optical properties. There is also no study on the effects of surface effects, phase transition mechanism, and sizes control mechanism on the development and research of devices. The phase transition, small size effects, and surface effects problem is the first problem to be solved for the research on nano-devices. By using combined mciroemusion method and solvothermal method,

英文关键词： Rare-earth；Complex Fluorides；Nanomaterials；Control Synthesis；Upconversion Luminescence