Sr2Mg1-xCaxSi2O7:Eu^2+,Dy^3+蓝色长余辉发光材料的合成及余辉性能调控

Synthesis of Sr2Mg1-xCaxSi2O7:Eu^2+,Dy^3+ Blue Long Afterglow Luminescent Materials and Its Afterglow Performance Regulation

为了调控长余辉发光材料的余辉寿命,利用Ca^2+对长余辉材料基质中的Mg^2+进行不同程度取代,即通过高温固相法制备了一系列Sr2Mg1-xCaxSi2O7:Eu^2+,Dy^3+(x=0, 0.2, 0.4, 0.6, 0.8, 1.0)长余辉发光材料。通过高温固相法制备的样品相较于溶胶-凝胶法所得样品具有更好的晶体结构,发光性能也更好。X射线衍射结果表明,随着原料中Ca^2+含量的增加,合成样品的衍射峰逐渐往高角度移动,表明该基质内Ca^2+已经取代Mg^2+的晶格位置,使晶格发生变化,晶体场发生改变。样品发射峰位于487~492 nm,为蓝色发光材料。通过观察余辉衰减图和初始余辉亮度值可知,随着Ca^2+含量的增加,样品的余辉衰减寿命和发光强度逐渐减小。以上性质有望使该材料在需要短寿命余辉产品领域有新的应用前景。

In order to regulate the afterglow life of long afterglow luminescent materials,a series of Sr2Mg1-xCaxSi2O7:Eu^2+,Dy^3+(x=0,0.2,0.4,0.6,0.8,1.0)long afterglow luminescent materials was prepared by the high temperature solid-phase method with the strategy of using Ca^2+to replace Mg^2+in the matrix of long afterglow materials.Compared with sol-gel method,the samples prepared by high temperature solid-phase method had better crystal structure and luminescence performance.X-ray diffraction results showed that the diffraction peaks of the synthesized samples shifted to high angle with the increasing of Ca^2+content,indicating that Ca^2+had replaced the lattice position of Mg^2+in the matrix and the change of the crystal field in the matrix was realized.The emission peaks of the samples were located at 487 nm to 492 nm,which suggested they were blue luminescent materials.The data of the afterglow decay curves and the initial afterglow brightness indicated that the afterglow decay life and luminous intensity of the samples gradually decreased with the increase of Ca^2+content.This property was expected to enable these materials to have a new application prospect in the field of short-life afterglow products.