水热均匀沉淀-熔盐煅烧法制备YAG:Ce^(3+)荧光粉及其发光性能的研究

Preparation of YAG:Ce^(3+) Phosphor by Hydrothermal Homogeneous Precipitation-molten Salt Method and Its Luminescent Properties

以Na2SO4-K2SO4为熔盐,采用水热均匀沉淀-熔盐煅烧法制备了YAG:Ce3+黄色荧光粉,应用XRD、SEM、荧光分光光度计等测试手段研究了熔盐辅助煅烧对粉体结构、形貌和发光性能的影响。结果表明,以尿素为沉淀剂,采用水热均匀沉淀法制备的前驱体,经Na2SO4-K2SO4熔盐辅助煅烧,900℃时已完全转变为YAG相,与固相法相比,YAG相的完全转变温度降低了600℃,与前躯体直接煅烧相比,YAG相的完全转变温度降低了300℃,荧光粉的发光强度提高了2.4倍。

The cerium-doped yttrium aluminum garnet（YAG ： Ce^3＋ ） phosphors are synthesized via a hydrothermal homogeneous precipitation-molten salt method（HHPMS）. The powder structure, morphology and photoluminescence are characterized by XRD, SEM and fluorescence spectrophotometer, respectively. The results indicate that the YAG = Ce^3＋ phosphor can be prepared using urea as precipitator and Na2 SO4-K2SO4 as molten salts. Compared with the solid state reaction method and hydrothermal homogeneous precipitation-direct calcination method（HHPDC）, the prepared temperature of YAG ： Ce^3＋ phosphor with the present method can be decreased about 600℃ and 300℃, respectively. And the luminescent intensity of as-prepared phosphor can be increased 2. 4 times than the phosphor pre-pared by HHPDC method.