ABSTRACT

Y(Lu)AG:Ce³⁺,Sm³⁺ yellow phosphors were prepared by molten salt method with 0.1NaCl-0.1KCl-0.8NaF as the molten salt. The effects of multi-factor variables on the properties of Y(Lu)AG:Ce³⁺,Sm³⁺ phosphors were comprehensively studied by orthogonal experiments which is a method to study the experiment with multi-factor variables and select some representative ones from the comprehensive experiment to find the optimal experimental conditions. The optimum synthesis conditions were as follows: Ce³⁺ concentration 0.06 mol%, Lu³⁺ concentration 0.5 mol%, Sm³⁺ concentration 0.02 mol%, calcination temperature 1300^oC, insulation time 1.5 h. The effects of introduction of Lu³⁺ on the crystal structure, temperature stability and luminescence properties of YAG:Ce³⁺,Sm³⁺ were studied. The results showed that due to the introduction of Lu³⁺ ions, the matrix lattice slightly changed (belonging to the cubic crystal system), the emission peak was blue shifted, temperature stability improved and decay reduced, which plays an important role in improving the lifetime of white LEDs.

摘要

采用熔盐法以0.1NaCl-0.1KCl-0.8NaF为熔盐制备了Y（Lu）AG：Ce ³⁺，Sm ³⁺黄色荧光粉。通过正交实验全面研究了多因素变量对Y（Lu）AG：Ce ³⁺，Sm ³⁺荧光粉性能的影响，这是一种研究多因素变量并从中选择一些代表性变量的方法。综合实验，寻找最佳实验条件。最佳合成条件如下：Ce ³⁺浓度为0.06 mol％，Lu ³⁺浓度为0.5 mol％，Sm ³⁺浓度为0.02 mol％，煅烧温度为1300 ^oC，保温时间1.5小时。研究了Lu ³⁺的引入对YAG：Ce ³⁺，Sm ³⁺的晶体结构，温度稳定性和发光性能的影响。结果表明，由于引入了Lu ³⁺离子，基体晶格发生了微小变化（属于立方晶系），发射峰发生了蓝移，温度稳定性提高，衰减降低，这对改善晶体结构起着重要作用。白光LED的使用寿命。