白光LED用高效红色荧光粉的控制合成及发光机理研究

项目名称： 白光LED用高效红色荧光粉的控制合成及发光机理研究

项目编号： No.51302125

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： 李怀勇

作者单位： 聊城大学

项目金额： 25万元

中文摘要： 红色荧光粉作为固态白光光源的重要组成部分，其性能直接影响固态白光光源的流明效率，使用寿命、显色指数及色温等指标。Eu3+离子激活的钼钨酸盐在近紫外光区有较宽的激发带，是理想的红色荧光材料。对于此类材料仍有两个问题需要解决以提高其总体荧光效率：（1）如何调控基质对特定波长的激发光的吸收，提高材料对能量的吸收效率；（2）如何阻止激发能在基质晶格内的猝灭，强化基质晶格和Eu3+离子间的能量传递，提高能量的传递效率。针对这些问题，本课题拟以Eu3+离子激活的钼钨酸盐为研究对象，对具有特定微结构特征的微纳米晶材料进行控制合成；结合量子力学计算对基质材料的能带结构和电子结构进行表征。研究基质对特定波长激发光的吸收机制，以及激发能在晶格中的猝灭和传递机理。在此基础上实现对钼钨酸盐材料荧光性能的调控，提高其荧光效率，并为新材料的开发设计提供理论支持。

中文关键词： 钼钨酸盐；微纳米晶；控制合成；能量传递；发光机理

英文摘要： Red phosphor is one of the most important parts in white solid-state light sources, and its performance affects the luminous efficiency, lifetime, color rendering index and color temperature of the white solid-state light sources straightly. Eu3+ ion-activated molybdates/tungstates are promising candidate as red phosphor for white solid-state light sources because they have broad excitation band in the near-UV region. At present, there are two problems to be resolved to improve the luminescence efficiency of these materials. One of them is how to increase the efficiency of energy absorption of host lattice by adjusting the excitation wavelength of the material; the other problem is how to increase the efficiency of energy transfer by preventing the quenching of energy in the host lattices and promoting the energy transfer from host lattices to doped Eu3+ ions. In order to solve these problems, we propose to perform an investigation on the Eu3+ ion-activated molybdates/tungstates. A series of Eu3+ ion-activated molybdates/tungstates having designed micro-structure will be synthesized and characterized. At the same time, the energy band structure and electronic structure of the host materials will be calculated according to density functional theory. The mechanism of the host lattices absorbing light in a specific

英文关键词： molybdates/tungstates；micro-/nano-crystalline；controllable synthesis；energy transfer；luminescence mechanism