近紫外白光LED用稀土“离子对”掺杂单一基质碱土硅酸盐基白光荧光材料的能量传递与光谱调控研究

For the requirements of energy saving and pollution emissions reduction and environmental protection, combined with China′s policy of semiconductor lighting and the research status of phosphors for LED, the alkaline earth silicate-based phosphors has a broad application prospect in the field of white LED for its advantages of high luminous efficiency, good thermal stability and environmentally friendly. In this project, the rare-earth ion pair doped single phase alkali-earth silicate-based Whtie Phosphors as the research object, through the material design, synthesis method to explore, to carry out the development of the rare-earth ion pair doped single phase alkali-earth silicate-based Whtie Phosphors by energy transfer. To research the effect of the type and concentration of rare-earth ion pair to the optical properties of phosphors, combined with phosphors′ optical properties and electronic structure calculations, to clarify the change rule of the influence of the crystal structure, electronic structure to the luminescent properties of phosphors, to put forward an effective way to achieve a single phase white phosphors spectrum regulation, to establish the theoretical model of energy transfer in double doping system. Research is focused on the intrinsic relationship between the luminescence characteristics, quantum efficiency, color rendering index and the crystal and electronic structure, to solve the optimization problems both luminous efficiency and color rendering index. For the development of high efficiency, high color rendering, low attenuation of white LED and lay the foundation for a green, energy conservation solid-state semiconductor lighting engineering applications in the future.

针对节能减排与环境保护的要求，结合我国"半导体照明"政策与LED用荧光材料的研究现状，碱土硅酸盐基荧光材料凭借其发光效率高、热稳定性好和环境友好等优点备受关注，在白光LED领域有广阔的应用前景。本项目以稀土"离子对"掺杂的单一基质碱土硅酸盐基白光荧光材料作为研究对象，主要通过材料设计、合成方法探索，开展新型利用能量传递"离子对"掺杂的单一基质荧光材料的开发。研究稀土"离子对"种类及含量对荧光材料光学性质的影响，结合荧光材料光学性能和电子结构计算，阐明晶体结构、电子结构对荧光材料发光性能影响的变化规律，提出实现单一基质白光荧光材料光谱调控的有效途径，建立双掺杂体系能量传递的理论模型。重点研究其发光特性、量子效率和显色性与晶体和电子结构之间的内在联系，解决双掺杂体系发光效率和显色指数的优化问题。为研制高效率、高显色性、低衰减的白光LED及其在未来绿色、节能的半导体固态照明工程中的应用奠定基础。

针对节能减排与环境保护的要求，结合我国“半导体照明”政策与LED 用荧光材料的研究现状，单一基质氧化物基白光荧光材料凭借其颜色稳定、色彩还原性好和环境友好等优点备受关注，在白光LED 领域有广阔的应用前景。本项目以稀土离子掺杂的单一基质碱土硅酸盐、磷酸盐基荧光材料作为研究对象，主要通过材料设计、合成方法探索，开展新型利用能量传递和光谱调控在单一基质中获得白光及颜色可调谐荧光材料的开发。主要以晶体场理论为指导，通过改变基质成分和结构调节激活离子所处的晶体场环境来调节发光强度、颜色和其它性质，同时研究稀土“离子对”种类及含量对荧光材料光学性质和荧光寿命的影响，探讨共掺杂体系中的能量传递机理，提出实现单一基质荧光材料光谱调控的有效途径和改善材料发光效率和显色性的有效方法。为研制高效率、高显色性、低衰减的白光LED 及其在未来绿色、节能的半导体固态照明工程中的应用奠定基础。在项目执行期间，共发表学术论文10篇，完成了项目的预期研究目标。