稀土离子掺杂的自激活下转换发光材料研究

项目名称： 稀土离子掺杂的自激活下转换发光材料研究

项目编号： No.11204005

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 李勇

作者单位： 安徽工业大学

项目金额： 28万元

中文摘要： 为提高太阳光谱中紫外可见区域的能量吸收能力和吸收范围以及下转换效率，项目申请人提出了"稀土离子掺杂的自激活材料下转换发光材料研究"的课题。它选择能量传递效率高且在紫外可见区域具有宽谱带吸收能力的自激活材料为发光主体，并掺杂在该区域同样具有宽谱带吸收能力的稀土离子，通过与发光中心Yb离子的能量传递过程，达到近红外下转换的效果，可极大地提高太阳光谱中紫外可见区域的能量利用效率和下转换效率。本课题针对不同的自激活材料体系，掺杂不同的稀土离子，通过比较不同基质组分对自激活基质本身和掺杂的稀土离子在紫外可见波段的吸收行为、能量传递效率和Yb离子发光强度的影响；通过比较稀土离子掺杂前后的下转换光谱性质变化，揭示稀土离子掺杂的自激活下转换材料的能量传递机理，阐明影响下转换效率和Yb离子发光强度的因素。探索提高Yb离子猝灭浓度或防止浓度猝灭的方法。为稀土近红外下转换材料研究提供新思路和新材料体系。

中文关键词： 发光材料；下转换；稀土；能量传递；

英文摘要： In order to improve the performance of absorption cabability and absorption region and the eficiency of downconversion, the study for downconverson of self-activated materials doped with rare earths are proposed here. The materials choose self-activated materials as matrices which exhibit high efficiency of energy transfer, and broad-band absorption capability in ultraviolet and visible regions. The doping ions of rare earths also have a wide band absorption capacity in ultraviolet and visible regions. The self-activated materials doped with rare earths can greatly improve the efficiency of energy utilization in UV-visible region of the solar spectrum and conversion efficiency. This project targets different self-activated materials doped with different rare earths, and focuses the influence of different matrix components on absorption behaviors of the self-activated matrix itself and the doping ions in UV-visible region, efficiency of energy transfer and luminescent intensity of Yb ions. The mechanisms of energy transfer are revealed through study on the changes of luminescent properties after and before doping rare earths ions. And the influencing factors of conversion efficiency and luminescent intensity are clarified. The methods of increasing the quenching concentration of Yb ions or preventing concentratio

英文关键词： Luminescent materials；Downconversion；Rare earths；energy transfer；