固相制备Li4-3xEux（MoO4）2微晶及发光性能

Solid-state reactions of Li4 -3xEUx （ MoO4 ） 2 microcrystallines and their luminescent properties

采用固相法制备了Li4-3xEux（MoO4）2系列红色荧光粉。通过荧光分析（FL）、扫描电镜（SEM）和X射线衍射（XRD）对所得粉体的发光性能、颗粒大小及形貌和物相进行表征分析。XRD分析表明制备的Li4-3xEux（MoO4）2微晶均为白钨矿四方结构；SEM结果显示随着x的增大，Li4-3xEux（MoO4）2微晶的晶粒尺寸相应增大，在0．2-1．4μm之间变化。荧光分析结果表明该荧光粉可被近紫外（395nm）光有效激发，最大发射波长位于614nm，获得纯正的红光。随着x的增大，样品中Eu3＋的592nm和614nm处两个特征发射峰的强度先增大后减小，当x=1．0时达到最大。

Li4-3xEux （MoOn）2 mierocrystallines were synthesized by solid-state reactions; the crystal structure, surface morphology and room temperature photolumineseence properties of the microcrystallines were investigated by X -ray powder diffraction （XRD）, scanning electron micrograph （SEM） and fluorescence analysis （FL）, respectively. XRD results confirm that the obtained Li4-3xEux （ MoO4 ） 2 microcrystallines all are typical scheelite structure with tetragonal symmetry. SEM measurements show that the grain size of Li4-3xEux（MoO4） 2 microcrystallines decreases with the increasing x, varies in the range of 0.2 -1.4μm. Fluorescence analysis results reveal that these phosphors can be effectively excited by ultraviolet（395 nm） light, emitting the maxium line at 614nm with pure red light. The emission intensity of the two characteristic emission peaks of Eu3＋ ion （located at 592nm and 614nm ） initially increases,reaches the maximum at 1.0, and then decreases with the increasing x.