二价钐激活复合氟化物磷光体的合成及光谱特性  

Synthesis and Spectral Characteristics of Divalent Samarium Activated Binary Fluorides

作　　者：曹志成[1] 石春山[1] 倪嘉缵[1] 

机构地区：[1]中国科学院长春应用化学研究所稀土化学与物理开放实验室,长春130022

出　　处：《化学学报》1993年第10期978-982,共5页Acta Chimica Sinica

基　　金：国家自然科学基金

摘　　要：报道了合成二价钐激活的复合氟化物的简单方法。用H_2作还原剂,用高温固相反应直接制得8m^(2+)激活磷光体:KMgF_3,LiBaF_3,BaBeF_4,SrMgF_4和BaMgF_4等,其中BaBeF_4,SrMgF_4和BaMgF_4中掺入Sm^(2+)为首次报道。在KCaF_3,CaBeF_4,SrBeF_4和CaMgF_4中只观察到Sm^(3+)发射而无Sm^(2+)发光。分析了钐离子价态与基质组成结构间关系,讨论了钐离子(8m^(2+)和Sm^(3+))的光谱特征。A simple technique for preparation of powder binary fluorides activated with divalent samarium ions is described. The samarium impurity is introduced as samarium trifluoride SmF_3 and hydrogen acts as the reducing agent to transform Sm^(3+) into Sm^(2+). Using this method, samarium has been stabilized in the divalent state in some fluorides: KMgF_3, LiBaF_3, BaBeF_4, SrMgF_4 and BaMgF_4. Moreover, BaBeF_4, SrMgF_4 and BaMgF_4 have never been activated with Sm^(2+) ions up to now. We also find that under the same synthetic conditions samarium can not be stabilized in the divalent state in some fluorides: KGaF_3, CaBeF_4 and CaMgF_4, but the characteristic luminescence of trivalent samarium Sm^(3+) appears in these matrices. The emission and excitation spectra of samarium (Sin^(3+) and Sm^(3+)) in these binary fluorides are presented and briefly discussed. The relationship between the oxidation state of samarium and the composition, the structure of matrices is also analyzed.

关 键 词：钐离子 价态 复合氟化物 荧光光谱 

分 类 号：O644.15[理学—物理化学]