白光LED用红色荧光粉SrMoO_4:Eu^(3+),Gd^(3+)的制备与表征  

Synthesis and Characterization of SrMoO_4:Eu^(3+),Gd^(3+) Red Phosphor for White LED

作　　者：关荣锋[1,2] 李勤勤[1] 孙倩[1] 

机构地区：[1]河南理工大学材料科学与工程学院,焦作454000 [2]盐城工学院江苏省新型环保重点实验室,盐城224051

出　　处：《人工晶体学报》2012年第4期1019-1024,共6页Journal of Synthetic Crystals

基　　金：河南基础与前沿技术研究计划项目(082300440150);河南省重点科技攻关项目(072102240027);江苏省新型环保重点实验室(AE201150)

摘　　要：采用共沉淀法合成了红色荧光粉Sr1-x-yMoO4∶Eu3x+,Gd3y+,分别对样品进行了X射线衍射(XRD)分析、扫面电镜(SEM)和荧光光谱(PL)的测定。结果表明:所合成的样品均为单一纯相四方晶系结构,添加Gd3+(为0.35mol时)使主衍射峰的位置右移了0.35°;SEM照片显示:SrMoO4∶Eu3+和SrMoO4∶Eu3+,Gd3+颗粒尺寸分布相对均匀,为类方块状,颗粒大小约为1～3μm;Gd3+和Eu3+的共掺得到的SrMoO4∶Eu3+,Gd3+在616 nm处主发射峰的发光强度约是SrMoO4∶Eu3+的2.09倍;当掺杂x=0.25 mol和y=0.35 mol时,在近紫外光(395 nm)激发下,SrMoO4∶Eu3+,Gd3+得到616 nm处红光发射极峰。A novel red emitting phosphor Sr1-x-r MoO4 ： Eux3＋ , Gdy3＋ was successfully synthesized by co- precipitation method. The crystal structure, morphology and luminescent properties of samples were characterized by X-ray diffraction（ XRD）, scanning electron microscope（ SEM）, and photoluminescence spectrophotometer （PL）. The results indicated that all the phosphor are isostructural and share a tetragonal scheelite structure of space group I41/a88 ; After adding Gd3＋ （y -0.35 mol）, it is found the main diffraction peak position shifted to the right of 0. 35% The results of SEM show that the particles size of SrMoO4： Eu3＋ and SrMoO4： Eu3＋ , Gd3＋ is relatively uniform, displays the blocks structure of regular shape, which size is about 1-3μm; Under 395 nm, it is found that the luminescent intensity of SrMoO4： Eu3＋, Gd3＋ is about 2.09 times higher than that of SrMoO4： Eu3＋ phosphor; the main emission spectrum peak at 616 nm achieves the maximum in Eu3＋ and Gd3＋ co-doped SrMoO4 phosphor when x =0.25 mol and y = 0.35 mol.

关 键 词：白光LED SrMoO4∶Eu3+ Gd3+ 红色荧光粉 共沉淀法 

分 类 号：O734[理学—晶体学]