【摘要】 首次在硅酸盐体系中发现了余辉时间长达10h以上的高亮度长余辉现象,并采用高温固相法合成了一系列硅酸盐长余辉发光材料。研究发现:Eu2+,Ln共激活的镁黄长石结构的焦硅酸盐化合物和镁硅钙石结构的硅酸盐化合物的余辉发光性能最好。研究了各发光材料的光谱特征、长余辉性能,测量了各发光材料的激发光谱和发射光谱以及余辉衰减曲线。同时研究了其应用性能,并测量了发光材料的热释光谱,X射线粉末衍射图谱,确定了发光材料的晶格类型。更多还原

【Abstract】 This paper deals with silicate long afterglow phosphors. It is reported in the f irst time that the afterglow time of the silicate phosphors can be last more than ten hours. Seri es of silicate long afterglow phosphors doped with Eu were made in MOM ′OSiO2(M=Ca,Sr,Ba;M′=Mg,Zn,Cd) system. It is found that disil icate of akermanite structure and silicate of okenite structure doped with Eu 2+,Ln have the best afterglow properties.The excitation and emission spectra, afterglow characteristics of the above phos phors were measured and investigated. The luminescence comes from typical 5d→4 f transfer of Eu2+. Emission color responds to M and structure, it chan g es continuously from blue to yellow. It is shown in decay curve that its aftergl ow property is better than the traditional (Ca, Sr) S∶Bi blue long afterglow ph osphors. The best afterglow property comes from disilicate doped with Eu, whose afterglow time is more than ten times of (Ca,Sr)S∶Bi, after illuminating stoppe d 60min. Thermoluminescence spectra identified the existence of long afterglow l uminescence. It is known by the measurement of Xray diffraction patterns that the luminescent material is akermanite crystal. It is shown by the result of ant iwater experiment that the antiwater property of CaSr silicate phosphor dope d with Eu2+ is obviously better than that of aluminates system long afterg low phosphors.更多还原