卤化物—二氧化硅纳米复合结构双功能薄膜的结构调控和发光特性研究

项目名称： 卤化物—二氧化硅纳米复合结构双功能薄膜的结构调控和发光特性研究

项目编号： No.11204039

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： 林林

作者单位： 福建师范大学

项目金额： 25万元

中文摘要： 在溶胶凝胶法（无含卤气氛）制备氟化物、以及对稀土掺杂的氟化物纳米晶玻璃陶瓷的量子剪裁特性研究基础上，用溶胶凝胶法制备稀土离子对掺杂的卤化物纳米晶-多孔二氧化硅基体的复合结构薄膜。稀土离子对选用Tb3+-Yb3+、Pr3+-Yb3+、Tm3+-Yb3+等，卤化物基质主要选用含稀土离子的氟化物和溴化物。利用低声子能量的卤化物结合稀土离子对，实现高量子剪裁效率。针对材料中离子对的各种量子剪裁机制建立速率方程。在此基础上结合蒙特卡洛模拟，研究量子剪裁主要机制，计算实际量子剪裁效率，并结合实验优化。通过薄膜制备条件调控卤化物纳米晶-多孔二氧化硅的复合结构，如纳米晶尺寸和形貌、薄膜厚度和孔隙度，在保证卤化物高发光效率的前提下，提高薄膜在太阳光谱波段的透射率，实现增透效果。最终所得的量子剪裁-增透双功能纳米复合薄膜，可作为光转换片应用于薄膜硅太阳能电池，极大提高其光转换效率。

中文关键词： 稀土离子；量子剪裁；贵金属；纳米颗粒；表面等离子增强效应

英文摘要： The fluoride was prepared by our group, by using the sol-gel method without halogen-containing atmosphere. The quantum-cutting (QC) properties of the glass ceramics involving the fluoride nano-crystalline doped with rare earth ions were also studied. In this project, we will investigate three parts based on the previous research. First, the composite film consisting of halide doped with rare earth ion pair (Tb3+-Yb3+, Pr3+-Yb3+, Tm3+-Yb3+, etc.) and porous silica is prepared by the sol-gel method. The main choice of the halide is the fluoride and bromide containing rare earth ions. A high QC efficiency can be achieved by the combination of the halide with low phonon energy and appropriate ions. Second, the rate equations are created aiming at different QC mechanisms. With the rate equations and Monte-Carlo simulation, the main mechanism is distinguished and investigated. Then, the actual QC efficiency can be calculated and optimized by the experiments. Third, the structure of the halide nano-crystalline and the porous silica is adjusted via the control of preparation conditions of the film. The structure parameters contain the size and surface topography of the nano-crystalline, the thickness and porosity of the film, etc.. Thus, the transmittance of the film in the range of solar spectrum is increased via the a

英文关键词： Rare-earth ions；quantum-cutting；noble metal；nano-particles；surface plasmon enhancement