激光照明用YAG∶Ce-CaF_(2)荧光陶瓷的冷烧结制备

Preparation of YAG:Ce-CaF_(2) Phosphor Ceramics for Laser Lighting Through Cold Sintering

荧光陶瓷是激光照明的关键材料。为探究低温制备荧光陶瓷的可行性,采用冷烧结工艺在425℃成功制备了致密度高、晶粒尺寸均匀、相界分明的YAG∶Ce-CaF_(2)复合荧光陶瓷。结果表明:发光相与基体之间没有可检测到的界面反应;制备的荧光陶瓷具有较高的量子效率(74.3%)、较好的热导率(室温可达9.4 W·m^(-1)·K^(-1))、优异的热稳定性(在400 K时发光强度仅损失4.3%);在蓝光激光(451 nm)激发下,复合荧光陶瓷表现出良好的黄光发射,并展现出光通量为910.7 lm和流明效率为91.07 lm·W^(-1)的高亮度白色激光照明,其荧光寿命无衰减(66 ns),相关色温为4483~8247 K,显色指数为73.4~83.6。冷烧结工艺是低温条件下制备性能优良荧光陶瓷的新方法。

Phosphor ceramics are the key materials for laser lighting,and this paper aims to explore the feasibility of preparing phosphor ceramics at low temperature.YAG∶Ce-CaF_(2) composite phosphor ceramics with high density,uniform grain size and clear phase boundary were successfully prepared at 425℃.The results show that there is no detectable interfacial reaction between the luminescent phase and the matrix;the prepared phosphor ceramics have higher quantum efficiency(74.3%),better thermal conductivity(room temperature up to 9.4 W·m^(-1)·K^(-1)),excellent thermal stability,only 4.3%loss of illumination intensity at 400 K.Under excitation by blue light laser(451 nm),the composite phosphor ceramics have good yellow light emission and high brightness white laser illumination with light flux of 910.7 lm and lumen efficiency of 91.07 lm·W^(-1).Their fluorescence life have no attenuation(66 ns),and the associated color temperature is 4483-8247 K,and the color development index is 73.4-83.6.Cold sintering process is a new method to prepare phosphor ceramics with excellent performance at low temperature.