纳米银复合的掺稀土硫系玻璃薄膜制备及其下转换发光研究

项目名称： 纳米银复合的掺稀土硫系玻璃薄膜制备及其下转换发光研究

项目编号： No.61205181

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 信息四处

项目作者： 许银生

作者单位： 宁波大学

项目金额： 28万元

中文摘要： 光谱下转换材料可将硅太阳能电池无法有效利用的高能紫外/可见光子转换为可以被其利用的近红外光子，增加硅太阳能电池的吸收效率，从而提高光电转换效率。为解决目前掺稀土光谱下转换材料存在的吸收带窄、近红外发光量子产率低等问题，本项目利用硫系玻璃的低声子能量特性和纳米Ag颗粒的等离子共振(SPR)宽吸收带，借助SPR引起的局域场增强效应，开展纳米Ag复合的掺稀土硫系玻璃薄膜设计、制备及下转换发光性能研究。主要内容包括：高浓度稀土离子掺杂硫系玻璃薄膜研制、纳米Ag的SPR峰位和带宽的可控机理研究、以及SPR对稀土离子下转换发光和量子产率的影响。在理论上结合Judd-Ofelt参数计算和Monte Carlo模拟，建立纳米银颗粒增强的稀土下转换发光模型。旨在获得紫外/可见区域有宽吸收、高近红外量子产率的纳米银复合掺稀土硫系玻璃薄膜材料制备技术，为推动今后下转换材料的产业化提供理论依据和科学的数据。

中文关键词： 下转换发光；硫系玻璃；表面等离子共振；发光材料；

英文摘要： Spectral down-conversion (DC) materials can convert one high energy UV/visible photon which can not be effectively utilized by the c-Si solar cells to two or more near-infrared (near-IR) photons around operating wavelength of the c-Si solar cells. The more near-IR photons emit, the more light will be absorbed by c-Si solar cells, and the higher photovoltaic conversion efficiency will be achieved. However, the most studied DC materials can not be used for c-Si solar cells due to their narrow absorption band of rare earth (RE) ions and the low quantum yield from UV/Visible to near-IR. To solve these problems, the nano-Ag/REs codoped chalcogenide glass films which take advantages of low phonon energy of chalcogenide glass, broad absorption band and local field enhancement (LFE) effect of nano-Ag's SPR will be designed and fabricated. This project will emphasize on the following three aspects, 1) design and fabricate the chalcogenide glass films with high concentration of RE3+/Yb3+(RE=Pr, Tb, Tm)ions co-doping; 2) the technique for preparation of the controllable SPR absorption band position and bandwidth; 3) the influence of SPR absorption and LFE effect of nano-Ag on the DC luminescence properties and quantum yield. Theoretically, the nano-Ag enhanced DC luminescence mechanism of the RE3+/Yb3+ ions codoped chalcog

英文关键词： Down-conversion emission；Chalcogenide glass；Surface plasmon resonance；Luminescent material；