用于白光LED的新型Eu2+/Tb3+/Sm3+或Eu2+/Sm3+共掺的红色荧光粉的制备、发光性质和晶体结构关系研究

项目名称： 用于白光LED的新型Eu2+/Tb3+/Sm3+或Eu2+/Sm3+共掺的红色荧光粉的制备、发光性质和晶体结构关系研究

项目编号： No.21301053

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 李玲

作者单位： 湖北大学

项目金额： 25万元

中文摘要： 作为第四代照明材料，白光LED因具有能耗低、寿命长、体积小、响应快、无污染等有优点而在众多照明领域尤其是在家用照明展现了广阔的应用前景。目前，应用最多也最成熟的光转换白光LED荧光粉因缺少红色成分而显色指数偏低。本项目依据Eu2+→Sm3+或Eu2+→Tb3+→Sm3+两种能量传递模型，以Eu2+作为敏化剂，Tb3+作为Eu2+和Sm3+之间能量传递的桥梁，拟设计在非还原条件下合成新型白光LED用Eu2+/Sm3+或Eu2+/Sm3+/Tb3+共掺杂的无机红色发光材料，研究煅烧温度、掺杂离子的浓度对发光性质的影响，阐明能量传递机理。利用复杂晶体的化学键介电理论分析计算能使Eu3+在非还原条件被还原，能使Eu2+在近紫外和蓝光区有强烈吸收，并能产生强红光发射的基质的化学键，环境因子特点以及结构性质规律，运用该规律指导选择基质。这为发展新型白光LED发光材料开辟了一条崭新的道路。

中文关键词： Sm3+;Tb3+;Eu2+;；LED荧光粉；化学键参数；白光；

英文摘要： As the fourth generation of lighting materials, white LED shows a broad application prospect in many lighting field, espectially in domestic lighting because of its low energy consumption, long service life, small volume, fast reponse, no pollution and other advantages. At present, the white LED phosphors, having most mature light conversion and most broad application, show low color rendering index because of lacking of a red component. This project is based on Eu2+→Sm3+ or Eu2+→Tb3+→Sm3+ two kinds of energy transfer models,in which Eu2+ ions are used as sensitizer and Tb3+ are used as energy transfer bridge. We will synthesize new white LED red phosphors doping Eu2+/Sm3+ or Eu2+/Tb3+/Sm3+ under nonreducing conditions.The effects of calcining temperature, doping concentration on the photoluminescent properties will be discussed, and the energy transfer mechanism will be summarized.Based on dielectric theory of chemical bond complex crystal, we will calculate properties of chemical bonds and environmental factors of matrixes, which makes teduction of Eu3+ under nonreducting conditions, makes Eu2+ ions have strong absorption in near ultraviolet and blue domain. We will deduce the law from the chemical bonds,environmental factors of matrixes, and the structure of crystals.Applying the law we can select the proper

英文关键词： Sm3+;Tb3+;Eu2+;；LED phosphor；chemical bonds；white light；