稀土掺杂铁电纳米线的发光可调研究

项目名称： 稀土掺杂铁电纳米线的发光可调研究

项目编号： No.51302077

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 周洪

作者单位： 湖南大学

项目金额： 25万元

中文摘要： 稀土发光可调材料在激光介质、光波导、显示器等方面具有巨大应用潜力，是今后重要的研究方向。我们前期的研究结果表明，稀土掺杂不仅改善了材料的铁电特性，还使材料具有优异的发光特性，然而关于铁电特性和发光之间的联系需要进一步研究。由于稀土离子的发光受晶体场的影响较大，铁电体独特的晶体结构使得在稀土掺杂铁电材料中，通过外加电场、应力等调控发光变得可能。但是，目前研究多偏重电场对发光的调控，且多局限于陶瓷块体。本项目拟采用外加电场和应力的方法，研究稀土掺杂发光铁电纳米线中，电场和应力对稀土离子光致发光的调控作用，以及尺寸效应带来的影响，并分析其中的发光动力学过程和失效机制，阐明外加电场、应力通过改变铁电材料的晶体场，从而影响稀土离子发光的具体物理过程，以及能量转移机制，为材料在光电功能集成器件等领域的应用奠定基础。

中文关键词： 纳米线；铁电；稀土；发光；

英文摘要： Rare earth luminescent materials with tunable photoluminescence (PL) properties have widespread applications, such as laser mediums, optical waveguides and display, and possess important research interest in future. Our previous research results have shown that doped with rare earth ions, ferroelectric materials posses both good PL and ferroelectric propeties. But further understanding of the relationship between ferroelectric properties and PL is needed. Luminescence from the rare earth ions is very sensitive to the crystal-field. The unique crystal structure of ferroelectric materials provides us an opportunity to tuning PL by controlling the external electric field and strain in rare earth doped ferroelectric materials. However, the present study electric mainly focus on the tuning PL by external electric field in bulks. The goal of this project is to develop a fundamental understanding of the kinetic process how the luminescence changes with structural symmetry in rare earth doped ferroelectric nanowires, as well as the tuning effects by these two different external factors. Through the study of this proposal, we could not only obtain the physical mechanism in the process of the tuning of PL, but also the failure mechanism of the tuning of PL.Under this proposal, we may figure out some fundamental issues for

英文关键词： nanowire；ferroelectric；rare-earth；photoluminescence；