新型稀土掺杂AlON多形体荧光粉的制备及性质研究

氧氮化物荧光粉具有优良的物理和化学稳定性，是白光LED照明中理想的光转换材料。Al2O3-AlN二元体系中含有大量的AlON多形体,而基于这些多形体的荧光材料还未被报道,因此,可望从中发现新型高效、稳定的氧氮化物荧光粉。本项目针对传统高温固相法所具有的合成温度高、产物相不纯等缺点，通过特殊的制备方法-高能球磨法在较低的合成温度下制备出一系列稀土掺杂的AlON多形体荧光粉，研究他们的发光和结构性质，优化高能球磨参数、烧结温度、保温时间、稀土掺杂浓度以及退火工艺。通过分析XRD, PL, EDS、TEM、XAFS等结果，揭示稀土离子在基质中的价态信息和配位环境，并结合第一性原理理论计算进行进一步验证。上述结构信息为进一步提高发光性能提供理论指导。把所得荧光粉涂覆在匹配的LED芯片上，考察荧光粉的实际应用效果。本项目通过实验和理论计算相结合，最终获得基于新型基质的性质优异的氧氮化物荧光粉。

Oxynitride phosphors are recognized as ideal light conversion materials due to their excellent physical and chemical stability. There are abundant AlON polyroids in Al2O3-AlN binary system.Unfortunately, the novel phosphors based on these polyroids have not been reported yet. Therefore, it is hopeful to explore and discover effective and stable novel oxynitride phosphors. This project employs special preparation method: high-energy ball mill to produce a series of rare-earth doped AlON polyroids phosphors at a low reaction temperature，compared with the disadvantages of high reaction temperature and impure products in traditional solid-state reaction. The luminescence and structure properties are studied. The parameters within high-energy ball mill, firing temperature, holding time, rare-earth doping concentration and annealing technologies are optimized. The valence and coordination information of rare-earth in matrix is revealed by the analysis of XRD, PL, EDS, TEM, XAFS and so on, which is further proved by the first principle calculation. The above structure information supports theoretical guidance to further increase luminescence performance. To investigate practical application effect, the obtained phosphors are coated on LED die. This project combines experiment and theoretical calculation, aiming to finally obtain excellent oxynitride phosphors based on novel matrix.