Ca_8Mg（SiO_4）_4Cl_2中Ce^（3＋）的光谱与晶体学格位

Spectra and Crystallographic Sites of Ce￣(3+) in Ca_8Mg(SiO_4)_4Cl_2

合成了新型蓝色光致发光材料Ｃａ８Ｍｇ（ＳｉＯ４）４Ｃｌ２：Ｃｅ（３＋），并对其进行了光谱测试．分析了Ｃｅ（３＋）在Ｃａ８Ｍｇ（ＳｉＯ４）４Ｃｌ２晶体中应占据的晶体学格位．测试结果表明，在紫外光激发下，Ｃａ８Ｍｇ（ＳｉＯ４）４Ｃｌ２：Ｃｅ（３＋）的发射光谱为一峰位在４１０ｎｍ～４２５ｎｍ之间的宽谱带，经分析确认作为发光中心的Ｃｅ（３＋）占据Ｃａ８Ｍｇ（ＳｉＯ４）４Ｃｌ２晶体中多面体八配位的Ｃａ（Ⅱ）格位．

A new kind of blue luminescence materials Ca,Mg(SiO.).CI,: Ce3+ has been synthesized.The spectra of the new phosphor have been determined. On the basis of analysing the excitation and emission spectra, the crystallographic sites of Ce3+ in Ca,Mg(SiO.).CI, crystal is discussed. The results of the mesurement indicate that the emssion spectra of Ca,Mg(SiO.).CI,: Ce3+ are single broad bands under the excitation of UV light. All these peak-positions are in 410 'm￣425 urn.We analysed the crystal structure of Ca,Mg(SiO.).CI,, obtaining the conclusion that the luminescence centers Ce3+ occupy the sites of Ca(I )-- a polyhedral site surrounded by six oxygen and two chlorine atoms in Ca,Mg(SiO.).CI,.