La^(3+)或Y^(3+)掺杂Ca_(2)SiO_(4):Eu^(3+)荧光粉的制备及发光性质研究

摘要

以硅酸盐作为发光基质,采用溶胶凝胶法,分别制备出La^(3+)或Y^(3+)掺杂Ca_(2)SiO_(4):Eu^(3+)的红色荧光材料,用扫描电子显微镜和荧光分光光度计分别对(Ca_(1.485-1.5x)Re_(x))2Si O_(4):0.03Eu^(3+)(Re=La或Y,摩尔掺杂量x=0,0.03,0.06,0.09,0.12,0.15)的形貌和发光性质进行了研究.实验表明:在摩尔掺杂量x=0.09时,(Ca_(1.485-1.5x)Y_(x))_(2)Si O_(4):0.03Eu^(3+)的分散性、均一性比(Ca_(1.485-1.5x)La_(x))_(2)Si O_(4):0.03Eu^(3+)好;用308 nm近紫外光去激发所制的样品,在发射波长为616 nm处,x为0.09时,样品都发红光且发光强度最好,也就是说掺La^(3+)或Y^(3+)都可以提高红色荧光粉的荧光强度,掺Y^(3+)红色荧光粉的荧光强度强于掺La^(3+)红色荧光粉.因此,在摩尔掺杂量为0.09时,制备出的(Ca_(1.485-1.5x)Y_(x))_(2)Si O_(4):0.03Eu^(3+)红色荧光粉性能最好.