掺杂离子再分布调控Whitlockite型荧光粉发光性质的研究

项目名称： 掺杂离子再分布调控Whitlockite型荧光粉发光性质的研究

项目编号： No.21501058

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 周文理

作者单位： 湖南师范大学

项目金额： 25万元

中文摘要： 荧光粉发光性质的调控一直是无机发光材料领域的重要科技问题。目前，调控发光的策略主要针对发光中心所处的局部环境，发光性质的调控幅度受限。为了大波长范围调控Whitlockite型荧光粉的发光性质，本课题提出掺杂离子再分布的新策略。主要思路是，选择具有五个不同格位的β-Ca3(PO4)2作为模型体系，通过不同价态、尺寸及浓度的阳离子取代Ca2+，驱动Ce3+/Eu2+/Mn2+在晶格中重新分布，达到大波长范围调控其发光性质的目的。主要研究内容如下：（1）基质阳离子取代的Whitlockite型荧光粉的合成与表征；（2）掺杂离子再分布调控发光性质的机理；（3）能量传递与器件性能。基于对这些内容的研究，有望深入理解Whitlockite型荧光粉结构、组分与发光性质的关系，探索出多格位荧光粉实现发光性质调控的新机制及相关材料的设计原则，为发展新型固态照明用荧光粉提供依据和参考。

中文关键词： 发光调控；稀土离子；固溶体；Whitlockite型荧光粉；能量传递

英文摘要： Tuning the luminescence properties of phosphor has always been a hot research topic in the field of inorganic luminescent materials. However, the current regulation strategies are mostly the fine-tuning of the local environment of luminescence center, and thus the tuning of luminescent spectrum is limited. In order to tune the luminescence of phosphor in a large scope, we put forward in this project redistribution of dopant ions as a new regulation strategy. The main idea is to choose β-Ca3(PO4)2 of five different cation sites as a model system. Substitution of Ca2+ with cations of different valence, size and concentration to drive the redistribution of Ce3+/Eu2+/Mn2+ ions on the host lattice may achieve the purpose of regulating the luminescent properties. The main contents of this project are as follows: (1) Synthesis and characterization of Whitlockite-type phosphors with host cations replacement; (2) Mechanism of tuning luminescence through the redistribution of dopant ions; (3) Energy transfer and device performance. On the basis of these studies, it is expected to obtain an in-depth understanding of the relationships between structure, composition and luminescence properties of Whitlockite-type phosphors, to obtain information on new mechanisms of tuning the luminescence of phosphors with multisites and the design principle of relevant materials, and to provide a basis and reference for development of new solid-state lighting phosphors.

英文关键词： tuning of luminescence;rare-earth ions;solid solution;Whitlockite-type phosphors;energy transfer