Gd^(3+)对SrWO_4:Dy^(3+)荧光粉发光性能的影响

Effect of Gd^(3+) on the Luminescence Properties of SrWO_4:Dy^(3+) Phosphor

采用水热微乳液法合成了SrWO4:Dy3+,Gd3+系列发光材料。利用XRD、SEM和荧光测试对热处理后样品的结构、形貌和发光性能进行了表征。XRD结果表明:SrWO4:Dy3+,Gd3+的结构属四方晶系。以365nm紫外光为激发源,测得SrWO4:0.05Dy3+,0.05Gd3+的发光光谱主要发光峰位于487nm、575nm处,分别对应于Dy3+的4F9/2→6H15/2、6H13/2跃迁,Gd3+可以增强Dy3+发光强度;当Gd3+掺杂的摩尔分数大于2%时,出现了浓度猝灭现象。色坐标分析显示:荧光粉的色坐标随着掺杂离子Gd3+的浓度加入量改变而发生变化。x(Gd3+)为1%的样品的色坐标为(0.332,0.311),位于标准白光点的色坐标范围内。

SrWO4：Dy3＋,Gd3＋phosphors were prepared by hydrothermal microemulsion,precipation and hydro-thermal method. The structure, morphology and luminescence properties of the samples after heat treatment were characterized by XRD,SEM and luminescence spectroscopy. According to measurements with X-ray diffraction,this material belongs to tetragonal system. The main and second emission peaks are located at 575 nm and 487 nm under 365nm UV light excitation,which corresponds to the 4 F9/2→6 H13/2 and the 4 F9/2→6 H15/2 transitions of Dy3＋ ions,re-spectively. It is suggested that Dy3＋ ion is sensitized strongly by Gd3＋ ion. The concentration quenching happens when the concentration of Gd3＋ is 2%. The chromaticity coordinate of the phosphors change with the doping con-centration. When x（Gd3＋）is 1%,the chromaticity coordinate of the phosphor is（0. 332,0. 311）which locates with-in the scope of the chromaticity coordinate of the standard white point.