UCr4C4基新物相结构设计、可控制备与稀土掺杂发光性能研究

项目名称： UCr4C4基新物相结构设计、可控制备与稀土掺杂发光性能研究

项目编号： No.91622125

项目类型： 重大研究计划

立项/批准年度： 2017

项目学科： 一般工业技术

项目作者： 夏志国

作者单位： 北京科技大学

项目金额： 80万元

中文摘要： 窄带红光发射材料对于调控白光LED色温和效率提升、满足广色域LED液晶背光源应用都具有重要的研究意义。本项目拟以UCr4C4基新物相结构设计为切入点，开展新结构类型的稀土掺杂固体发光材料研究，探讨结构/性能关联规律，可控制备白光LED照明与显示用高性能稀土发光材料。利用UCr4C4矿物模型丰富的框架结构、可调变的阴/阳离子格位，通过基质组分与结构调控，结合热力学稳定性理论计算，探索具有合适晶格振动模及频率的基质实现窄带红光发射；采用化学单元共取代策略设计UCr4C4基新物相，分析新物相晶体结构与局域结构；结合高压、常压制备及调控前驱体工艺与合成路线，获得系列氮化物、氮氧化物、氟氧化物和氧化物体系新物相；研究稀土掺杂UCr4C4基新物相发光性能，以及基质组成、结构与发光性能的相互关系，实现对其发光性能调控及其发光效率和稳定性提升，为白光LED照明与显示用的稀土发光材料研究奠定理论和实验基础。

中文关键词： 稀土发光材料；结构调控；单元共取代

英文摘要： The study on narrow-band red-emitting materials plays an important role in the modification of the color temperature and improvement of the efficiency of the white LEDs, as well as the requirement of the application in the backlight of LED liquid crystal with wide color gamut. This project focused on the structural design of the new phases with UCr4C4 model, and studied the rare earth doped solid luminescence materials with new structural types, and discussed the rules in structure-property correlation, and finally obtained the high-performance rare earth luminescence materials via the controllable preparation technique. Based on the flexible framework of the UCr4C4 model and different cation/anion sites, suitable hosts for narrow-band red phosphors can be designed, and their modification on the chemical compositions and structures can be combined with the thermodynamic stability theoretical calculation. The chemical unit cosubstitution can be adopted to design the UCr4C4-type new phases, and the crystal structure and local structures will be analyzed in detail. The high-pressure and normal pressure routes, as well as the technique including the different precursor and synthesis method have been studied for the preparation of the new nitrides, oxynitrides, oxyfluorides and oxides phases. By controlling the chemical compositions and crystal structure and the investigations on the relationship of the compositions, structures and luminescence properties, the emission intensities, thermal stability and quantum efficiency can be enhanced. Accordingly, the scientific foundation both for theory and experiment have been established in order to explore the new rare earth luminescence materials for white LEDs illumination and display.

英文关键词： Rare earth doped luminescence materials;Structural modification;Unit Cosubstitution