柠檬酸辅助合成NaLa(MoO_4)_2:Eu^(3+)及其发光性能  

Citric acid-assisted synthesis of NaLa(MoO_4)_2:Eu^(3+) phosphors and luminescence properties

作　　者：刘运[1] 高伟萍 史晓磊[1] 罗超[1] 左浩强 

机构地区：[1]陕西科技大学理学院,陕西西安710021

出　　处：《陕西科技大学学报（自然科学版）》2015年第5期40-45,共6页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(51272148);陕西省科技厅自然科学基础研究计划项目(2014JM6237)

摘　　要：柠檬酸辅助水热合成并在600℃条件下煅烧2小时制备出了红色荧光粉NaLa(MoO4)2:Eu3+,并采用X射线衍射(XRD)、场发射扫描电镜(FE-SEM)和荧光光谱(PL)等对样品进行了表征.结果表明:产物为纯四方相结构;随着Eu3+形成固溶体的浓度增加,发光强度逐渐增强,电荷迁移带宽化并红移;当Eu3+形成固溶体的浓度为50%时,产物发光强度最大;所制备样品能够被紫外光(280nm)、近紫外光(395nm)和蓝光(465nm)有效激发,其主发射峰均位于617nm处Eu3+的5 D0→7F2特征跃迁;所得产物色坐标稳定且与NTSC红色色坐标非常接近.因此,该方法制备的NaLa(MoO4)2:Eu3+荧光粉是一种性能稳定、可被广泛应用的红色发光材料.Eu3＋‐doped NaLa （MoO4 ）2 red phosphors were prepared via a citric acid‐assisted hydrothermal process and the samples were annealed at 600 ℃ for two hours .The asprepared products were characterized by X‐ray diffraction （XRD） ,field emission‐scanning electron mi‐croscopy （FE‐SEM ） and photoluminescence （PL ） ,respectively .The results demonstrated that the obtained NaLa（MoO4 ）2 ：Eu3＋ phosphors are pure tetragonal phase of which the e‐mission intensity enhanced with the increasing of Eu3＋ doping concentration .Moreover ,the charge transfer band shift to the red with broadening of its peak ,and the optimum Eu3＋ do‐ping concentration for obtaining maximum emission intensity was confirmed to be 50% .In addition ,the phosphor can be effectively excited by 280 nm ,395 nm and 465 nm .All com‐pounds exhibit strong luminescence emissions of 5 D0 → 7 F2 transition at 617 nm .Chromaticity coordinates of NaLa（MoO4 ）2 ：Eu3＋ are stable and fit well with the standard red color coordi‐nate .The results indicate that NaLa（MoO4 ）2 ：Eu3＋ is a wide used red‐emitting phosphors with good stability .

关 键 词：NaLa(MoO4)2:Eu3+ 柠檬酸 水热合成 发光性能 

分 类 号：TB34[一般工业技术—材料科学与工程]