镧系硅氧氮化物荧光材料的晶体结构和发光特性

项目名称： 镧系硅氧氮化物荧光材料的晶体结构和发光特性

项目编号： No.51202053

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： 鲁法春

作者单位： 河北大学

项目金额： 25万元

中文摘要： 镧系硅氧氮化合物种类丰富，能为稀土离子提供丰富的掺杂环境。掺杂稀土离子后，该类化合物可被紫外、紫光或蓝光LED有效激发，并高效发射蓝光、绿光或红光，可作为荧光转换材料应用于白光LED照明中。但至目前为止，在该类化合物中，仅有少量化合物的晶体结构和发光性能得到了研究。制约人们对该类荧光材料进行研究的主要原因是该类荧光材料需要较高的制备条件，且某些化合物的晶体结构解析存在困难。在本课题中，我们拟采用高温氮化法制备该类荧光材料，并使用Rietveld结构精修技术对该类荧光材料的晶体结构进行解析。结合晶体结构解析结果，我们将对该类荧光材料的激发和发射光谱、晶场劈裂、能量传递、温度猝灭等发光特性和发光机理进行深入研究。我们的目的是制备一类能适用于白光LED照明的新型荧光材料，阐明稀土离子在该类荧光材料中的发光机理，揭示该类荧光材料中晶体结构对其发光性能的影响规律。

中文关键词： 硅氧氮化合物；荧光材料；晶体结构；发光物性；发光机理

英文摘要： Many species of Ln-Si-O-N compounds can be found in the lanthanide oxonitridosilicates. These compounds can provide kinds of doping environments for rare-earths. When the compounds are doped with rare-earths, they can be efficiently excited by the ultra-violet/purple/blue LED chip, and efficiently emit the blue/green/yellow light. These compounds can be used as the converted phosphors in white LEDs. But up to now, only a few kinds of these compounds have been studied for their crystal structures and luminescence properties. The reason restricting people to research these compounds is that these compounds always need critical synthesis conditions and the crystal structures of some of these compounds are difficult to resolve. In this research application, we are planning to synthesize these phosphors by the high-temperature solid state reaction under nitrogen atmosphere and resolve their crystal structures with the Rietveld refinement technique. With the analyses of the crystal structure, we want to systematically study their luminescence pproperties, such as the exciation and emission spectra, crystal splitting, energy trafer, temperature quenching and the others and so on. Our purpose is to acquire series of new oxonitridosilicate phosphors for white LED lighting, revel the luminescence mechanisms of the rare-ea

英文关键词： Oxonitridosilicate；Phosphor；Crystal structure；Photoluminescence properties；Photoluminescence mechanism