SrWO_4∶Gd^(3+),Tb^(3+)荧光粉的发光性质及能量传递

Luminescence Properties and Energy Transfer of SrWO_4∶Gd^(3+),Tb^(3+)

合成了SrWO_4∶Gd^(3+),Tb^(3+)两个系列荧光发光粉,其XRD衍射测试结果表明,合成材料结构均为体心四方晶系。颗粒的形貌为类球形,分散性很好,平均晶粒尺寸在3μm左右。荧光光谱检测表明,在223nm激发下,Sr_(0.9)WO_4∶0.05 Gd^(3+),0.05Tb^(3+)荧光粉最强发射峰位于549nm处,属于Tb^(3+)的~5D_4→~7F_5的跃迁,在该体系中存在Gd^(3+)→Tb^(3+)的能量传递,使得该荧光粉的发光强度随着Gd^(3+)掺杂浓度的增加而增大。

One serie SrWO4∶ Gd^（3＋）,Tb^（3＋）fluorescent powder were synthesized in this paper. The structure,morphology and luminescence properties of the samples were characterized by XRD,SEM and luminescence spectroscopy. XRD analysis confirmed the samples exhibited a body-centered tetragonal crystal structure. The particles of as-synthesized phosphors are basically spherical in shape,and well dispersed with the mean particle size of 3μm. In the emission spectrum of Sr（0. 9）WO4∶ 0. 05Gd^（3＋）,0. 05Tb^（3＋）excited by 223 nm,the main peak is located at about549 nm due to the transition of ~5D4→~7F5 of Tb^（3＋）emission. The PL intensity of Tb^（3＋）in Sr（0. 9）WO4∶ 0. 05Gd^（3＋）,0. 05Tb^（3＋）increases with the increase of x values due to an energy migration process like Gd^（3＋）→Tb^（3＋）occurred in the phosphors.