基于层状氢氧化物的白光LED用红色荧光粉的制备、性能及发光机理的研究

项目名称： 基于层状氢氧化物的白光LED用红色荧光粉的制备、性能及发光机理的研究

项目编号： No.51202054

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 无机非金属材料学科

项目作者： 高晓蕊

作者单位： 河北工程大学

项目金额： 25万元

中文摘要： 研制和开发新型的白光LED用红色荧光粉对提高当前白光LED发光效率、发光强度、显色指数等具有重要的科学意义和实用价值。基于层状氢氧化物（LDHs）的稀土无机-有机复合红色荧光粉已有报道，然而其发光机理尚不够明确，更没有被应用于白光LED。本项目在前期研究工作的基础上，以应用于白光LED为目标，采用共沉淀方法将激活剂Eu3+掺杂到LDHs层板上，通过离子交换法将具有多齿结构的多羧基有机配体插入LDHs的层间，从而构筑结构新颖的可用于白光LED的无机-有机复合红色荧光粉，并考察合成条件对荧光粉颗粒大小和粒径分布的影响，研究其结构与光学性能的关系，探讨其发光机理，最终获得颗粒大小适中且分布均匀、具有较高荧光强度和荧光效率的红色荧光粉。本项目不仅为制备新型白光LED用红色荧光粉提供一条崭新的途径，对于丰富固体发光理论、研究和开发白光LED用新型高效红色荧光粉具有重要的意义。

中文关键词： 白光LED；层状氢氧化物；红色荧光粉；发光性能；发光机理

英文摘要： Developing and studying a novel red fluorescent powder used in white light emitting diode (LED) have important scientific significance and value in use for improving the luminescent efficiency, intensity and color rendering index suffered from white LED. Some researches on the inorganic-organic composite red fluorescent powder containing lanthanide ions based on the layered double hydroxides (LDHs) have been reported, but their luminescent mechanism is not clear enough, even no one has been used in the white LED at present. Based on the previous researches, this project will dope Eu3+ in the layers of LDHs by a co-precipitation method, and then intercalate some organic anions which have multidentate ligands and several carboxyl groups between the layers by anion exchange method, and finally synthesize a novel inorganic-organic composite red fluorescent powder. Meanwhile, we will study the effect of synthesis conditions on the particle size and distribution of fluorescent powder, the relationship between structure and luminescent properties, and discuss the luminescent mechanism. The final aim of this project is to obtain a red fluorescent powder owning the uniform partical distribution, the higher luminescent strength, higher luminescent efficiency, and can be applied in the LED. This project not only supplies a

英文关键词： White light emitting diodes；Layered double hydroxide；Red phosphor；Luminescent properties；Luminescent mechanism