溶胶-凝胶法制备Ca_2MgSi_2O_7:Eu^(2+),Dy^(3+)发光粉  

Preparation of Ca_2MgSi_2O_7:Eu^(2+),Dy^(3+) Luminescent Powder by Sol-Gel Method

作　　者：周永强[1] 刘海涛[1] 吴磊[1] 田一光[1] 尹德武[1] 张景峰[1] 

机构地区：[1]温州大学化学与材料工程学院,浙江温州325027

出　　处：《稀有金属材料与工程》2008年第A02期337-339,共3页Rare Metal Materials and Engineering

摘　　要：以正硅酸乙酯、硝酸盐等为原料,用溶胶-凝胶法制备了Ca2MgSi2O7:Eu2+,Dy3+长余辉发光粉,探讨了前驱体制备工艺条件,用XRD等手段对发光粉进行了表征。结果表明:在pH=1～3,R≥4,控制共溶溶剂的用量,室温下即可形成均匀透明的溶胶和凝胶。前驱体在1100℃烧结3h制备出Ca2MgSi2O7:Eu2+,Dy3+长余辉发光粉。发光粉具有光致发光行为和长余辉发光特性,其发出的余辉为黄绿色,发光亮度低、余辉时间短,仅1h左右,其激发光谱在340～480nm之间存在一个强度较低的激发带,发射光谱的发射峰位于528nm。Ca2MgSi2O7： Eu2＋, Dy3＋ long afterglow luminescent powder was prepared by sol-gel method using tetraethylorthosilicate and nitrate as the raw materials. The preparing conditions of the precursor were determined. The powder was characterized by X-ray diffraction. The results show that transparent and homogeneous sol and gel can be prepared at pH= 1-3, R≥4, t≥room temperature, controlling dosage of solvent. The precursor prepared at R= 12, pH= 3, t=-50℃ is sintered to form Ca2MgSi2O7： Eu2＋, Dy3＋ afterglow luminescent powder at 1100℃ for 3 h. The powder has photoluminescence and long afterglow luminescent behavior and gives out yellow-green lower luminance long afterglow whose luminescent persistence time Iasts about 1 h. There is lower intensity excitation band at 340-480 nm on its excitation spectrum and emission peak on its emission spectrum is at 528 nm.

关 键 词：硅酸盐 长余辉 发光粉 溶胶-凝胶法 

分 类 号：TQ422[化学工程]