中文摘要：

采用传统的高温固相法成功合成了Sr3Ga2O5Cl2：Sm^3＋系列橙红色荧光粉。用X射线衍射仪（XRD）测试了样品的晶体结构，样品的形貌和颗粒尺寸由扫描电子显微镜（SEM）表征，用荧光光谱仪测试了样品的光致发光光谱和衰减寿命。Sr3Ga2OsCl2晶相为单斜结构，掺杂的Sm^3＋离子取代Sr^2＋的格位成为荧光粉的发光中心。样品的激发光谱由O^2-→Sm^3＋的电荷迁移带和Sm^3＋4f内层电子的特征激发峰组成，位于230nm、404nm的激发峰较强。发射光谱的峰值位于565、601、650nm处，分别对应于Sm^3＋的^4G5／2→^6H5／2、^4G5／2→^6H7／2、^4G5／2→^6H9／2特征跃迁。样品的发光强度随着Sm^3＋浓度的增加先增大后减小，最佳掺杂浓度为3．0％mol。根据实验数据对浓度淬灭的原因进行了探讨，浓度淬灭机理为电偶极-电偶极相互作用。

英文摘要：

A series of orange-red phosphors Sr3Ga2O5Cl2：Sm^3＋ are synthesized by the traditional high temperature solid-state method. The crystal structure of the sample is tested by X - ray diffraction （XRD）, and its morphology and particle size are characterized by scanning electron microscopy （SEM）. Photolumi-nescence spectra and decay lifetimes of the samples are measured using a fluorescence spectrometer. The crystal phase of Sr3Ga2O5Cl2 is monoclinic structure. Sm^3＋-doped ions replace Sr^2＋ sites to be the luminescence center of fluorescent powder. The excitation spectra of samples are composed of charge transfer band O^2-→Sm^3＋ and characteristic excitation peaks of Sm^3＋ 4f inner-layer electrons, and the excitation peaks located at 230 nm and 404 nm are stronger. The peaks of emission spectra are located at 565, 601,650 nm, which corresponds to the characteristic transition of Sm^3＋ from 4G5/2 level to ^6H5/2, ^6H7/2, ^6H9/2 levels, respectively. The luminescent intensity of samples increases first and then decreases with the increasing of Sm^3＋ concentration, and the best doping concentration is 3.0% mol. Based on the experimental data, the reason of concentration quenching is discussed. The concentration quenching mechanism is electric dipole-dipole interaction.