Ce掺杂SrMgF_(4)超结构多晶体的吸收/光致发光光谱  

Optical Absorption and Photoluminescence Spectra of Ce-doped SrMgF_(4)Polycrystalline with Superlattice Structure

作　　者：柳琪 朱璨 谢贵震 王俊[1] 张东明[1] 邵刚勤[1] LIU Qi;ZHU Can;XIE Guizhen;WANG Jun;ZHANG Dongming;SHAO Gangqin(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,武汉430070

出　　处：《无机材料学报》2022年第8期897-902,共6页Journal of Inorganic Materials

摘　　要：稀土(RE)离子掺杂的钙钛矿型氟化物是可调谐光学材料的候选材料。本工作通过沉淀法合成了SrMgF_(4):xCe(x=0,0.007,0.013和0.035)粉末。X射线衍射(XRD)分析表明所获得的荧光粉具有单斜超结构,价态分析证实存在Ce^(3+)/Ce^(4+)混合价,在紫外光区通过不同波长的激发光观察到两个荧光带B和C。当Ce^(3+)多面体的对称性从高对称变为低对称时,源于单斜超结构的晶体场导致能级发生强烈的改变。Rare-earth(RE)ions doped perovskite-related fluorides are candidates for tunable optical materials.In this work,SrMgF_(4):xCe(x=0,0.007,0.013 and 0.035,in mole)powders were synthesized by a precipitation method.X-ray diffraction(XRD)patterns indicate that the obtained phosphors possess monoclinic superstructures.Electrovalence analysis confirms the existence of Ce^(3+)/Ce^(4+)mixed valence.Two distinct fluorescence bands B and C were observed with different excitation wavelengths in the ultraviolet(UV)light region.Energy levels were modified strongly by the crystal field derived from monoclinic superstructures when the symmetry of Ce^(3+)-polyhedra changed from high-to low-symmetry.

关 键 词：SrMgF_(4) 铈掺杂 超结构 钙钛矿 光致发光 

分 类 号：TQ174[化学工程—陶瓷工业]