碱土金属锡酸盐掺铕体系荧光粉合成和荧光性质研究

Studies on the Synthesis and Fluorescent Property of Alkaline Earth Stannates Doped Europium

本文报道了MSnO_3∶Eu^(3+)和M_2SnO_4∶Eu^(3+)(M=Ca,Sr,Ba)体系荧光粉的合成和荧光性质。产品经X射线确证CaSnO_3∶Eu^(3+)和Ca_2SnO_4∶Eu^(3+)为正交晶系,SrSnO_3∶Eu^(3+)和BaSnO_2∶Eu^(3+)为立方晶系,而Sr_2SnO_4∶Eu^(3+)和Ba_2SnO_4∶Eu^(3+)为四方晶系。激发光谱表明,随Ba—Sr—Ca离子半径减小,Eu^(3+)的电荷迁移能量紫移,而Eu^(3+)的f-f跃迁红移。发射光谱表明,CaSnO_3∶Eu^(3+)和Ca_2SnO_4∶Eu^(3+)以电偶极跃迁为主,而其它4种化合物不存在电偶极跃迁。

The synthesis and fluorescent property of MSnO3 : Eu3+ and M2SnO4 : Eu3+(M = Ca,Sr, Ba) have been reported. The phosphors were prepared by mixing the solution of MCl2(M = Ca,Sr, Ba) SnCl2 and EuCl3 according to stoichiometry. Their oxalates were coprecipitated and sintered at 1400-1500℃ for 5-6 h. Structures of the phosphors were confirmed by X-ray diffraction analysis, and CaSnO3: Eu3+ and Ca2SnO4: Eu3+ belong to othorhomic system, SrSnO3: Eu3+ and BaSnO3 : Eu3+ the cubic, Sr2SnO4: Eu3+ and Ba2SnO4: Eu3+ the tetragonal. The excited and emission spectra of the phosphors show that, the energy of charge transfer transition for Eu3+ shifts to the blue, and energy of f-f transition for Eu3+ shifts to the red. The CaSnO3: Eu3+ and Ca2SnO4: Eu3+ show the major electric dipole transition. The other four phosphors show the major magnetic dipole transition.