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

Preparation and Luminescent Properties of La^(3+)or Y^(3+) Doped Ca_(2)SiO_(4):Eu^(3+) Phosphor

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.

The sol-gel method was used to prepare La^(3+)or Y^(3+) doped Ca_(2)SiO_(4):Eu^(3+) red fluorescent materials,using silicate as the luminescent substrate,and the morphology of the prepared samples was characterized by scanning electron microscope and studied by fluorescence spectrophotometer.The effects of different doping amounts of La^(3+)or Y^(3+) on the luminescence properties of the samples are shown.Experiments show that use 308 nm near ultraviolet light to excite(Ca_(1.485-1.5x)Re_(x))_(2)SiO_(4):0.03Eu^(3+)(Re=La or Y,molar doping amount x=0,0.03,0.06,0.09,0.12,0.15)red fluorescence powder,at the emission wavelength of 616 nm,the luminous intensity is the best when x is 0.09;doping La^(3+)or Y^(3+) can increase the fluorescence intensity of the red phosphor;(Ca_(1.485-1.5x)La_(x))_(2)SiO_(4):0.03Eu^(3+) has lower fluorescence intensity,then(Ca_(1.485-1.5x)Y_(x))_(2)SiO_(4):0.03Eu^(3+),and the latter has better dispersibility and uniformity.Therefore,when the molar doping amount is 0.09,the prepared(Ca_(1.485-1.5x)Y_(x))_(2)SiO_(4):0.03Eu^(3+) red phosphor has the best performance.