纳米复合结构的稀土掺杂透明玻璃陶瓷中表面等离子体共振增强的量子剪裁发光

项目名称： 纳米复合结构的稀土掺杂透明玻璃陶瓷中表面等离子体共振增强的量子剪裁发光

项目编号： No.11204301

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： 林航

作者单位： 中国科学院福建物质结构研究所

项目金额： 30万元

中文摘要： 具有近红外量子剪裁下转换发光特性的稀土掺杂材料在降低硅太阳电池的热化损失、提高光电转换效率方面有很大潜力，但是该材料的实际应用却受限于稀土的光吸收和下转换发射较弱等问题。鉴于贵金属纳米粒子的表面等离子体共振效应可以显著增强稀土离子的有效吸收和荧光发射，本项目拟采用熔体急冷法和后续热处理，制备同时含贵金属和稀土掺杂氟化物纳米晶的新型透明玻璃陶瓷，研究利用贵金属纳米粒子的表面等离激元增强稀土的紫外-蓝光吸收和近红外量子剪裁发光；结合经典的Mie光散射理论和Drude自由电子理论,探讨贵金属纳米粒子在氟氧化物玻璃陶瓷环境中的表面等离子体共振吸收特性；通过建立速率方程，重点研究材料中贵金属纳米晶表面等离激元荧光增强的动力学过程和机理，并总结贵金属和氟化物颗粒的尺度、分布对稀土近红外量子剪裁下转换发光性能影响的规律，进而优化纳米复合材料的晶化结构，进一步改善发光性能。

中文关键词： 量子剪裁；表面等离子体共振；光谱特性；玻璃陶瓷；太阳电池

英文摘要： Rare-earth ions (REI) doped materials with near-infrared (NIR) quantum cutting (QC) luminescent characteristics are regarded as promising candidates to reduce the carrier thermalization loss in the solar cell, and thus improve the photo-electric conversion efficiency, however, the low optical absorption and the weak QC luminescence of REI limit their practical applications. In view of the fact that the effective optical absorption and fluorescent emission of REI could be dramatically enchanced by the surface plasmon resonance (SPR) effect of noble metal nanoparticles, this project aims to prepare novel transparent glass ceramics embedded with noble metal and REI doped fluoride nanocrystals by melt-quenching and heat-treating techniques, to investigate the plasmonic enhancement on the ultraviolet-blue light absorption and the NIR QC luminescence of REI. The main goal is to explore the SPR characteristics of noble metal nanoparticles among the oxyfluoride glass ceramics by utilizing the classical MIE light scaterring theory and Drude free electron theory; to mainly investigate the dynamical processes and related mechanisms for the plasmonic enhancement on NIR QC luminescence by the rate equation analysis; to summarize the effects of the size and distribution of noble metal/fluoride nanocrystals on the NIR QC emiss

英文关键词： quantum cutting；surface plasmon resonance；spectral features；glass ceramics；solar cells