非还原气氛下直接白光荧光材料中Eu3+可控自还原机制及其光谱可调特征的研究

项目名称： 非还原气氛下直接白光荧光材料中Eu3+可控自还原机制及其光谱可调特征的研究

项目编号： No.51472223

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 刘艳改

作者单位： 中国地质大学（北京）

项目金额： 85万元

中文摘要： Eu2+是常用的荧光材料激活剂，由于需要还原条件下获得，具有能耗高、成本高等问题，还存在安全隐患。本项目提出通过对基质结构的优化、制备工艺参数和晶体场环境的控制，以Eu2O3为激活剂原料，在非还原气氛中采用固相法制备单独Eu2+稳定激活和Eu3+/Eu2+稳定共激活且比例可调的α-Mg2Al2Si5O18、SrAl2Si2O8、BaMgSiO4等特殊结构化合物为基质的荧光粉。在与还原气氛中制备的Eu2+离子激活荧光粉对照研究的基础上，研究探讨非还原气氛下Eu离子价态稳定性的影响因素，揭示普遍规律，阐明Eu离子的还原机理，并构建模型。获得非还原气氛下荧光材料中Eu3+离子可控自还原技术，并制备出光谱可调LED用直接白光荧光材料。研究结果将对低成本长寿命直接白光荧光材料的发展起到重要作用。

中文关键词： 发光材料；非还原气氛；Eu3+自还原；直接白光；价态控制

英文摘要： Eu2+, as a common luminescent materials activator, has some disadvantages such as high energy consumption, high cost and potential risk since it need to be prepared in reduced conditions. By optimizing the matrix structure, preparing technology and controlling crystal field environment, using Eu2O3 as the activator raw materials, luminescent powders, with special structural compounds (α-Mg2Al2Si5O18, SrAl2Si2O8, BaMgSiO4) as matrix and single Eu2+ or coexisting and tunable Eu3+/Eu2+ as the activator, will be prepared by solid state method in air in this project. By comparing with those luminescent powders activated by Eu2+ prepared in reducing atmosphere, the factors affecting the stability of Eu ionic valence in air will be studied. The rule of valence transition and reduction mechanism of Eu ion will be revealed. The module will also be built. The controllable self-reduction technology of Eu3+ in air and the preparation of direct-white phosphor with tunable spectrum will be obtained. The results of the research will contribute to the development of white phosphor with long life and low costs.

英文关键词： luminescent materials;non-reductive atmosphere;Eu3+ self-reduction;direct white light;Valence State-controllable