Tb(III)錯体を分散したSiO_2-ZrO_2及びSiO_2-Ta_2O_5系複合体の作製と蛍光特性

概要

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The terbium(III) 2, 2'-bipyridyl complex, [Tb(bpy)_2]Cl_3, was incorporated for the first time into partially metal oxide-substituted silica matrices derived from tetraethyl orthosilicate (TEOS) and metal alkoxides (M(OR)_n, M=Zr and Ta) via sol-gel process. The optical properties of the obtained [Tb(bpy)_2]Cl_3-dispersed inorganic-organic composite materials were characterized by measurements of photoluminescence, transmittance, infrared spectra and X-ray diffraction patterns. The emission intensity of the (SiO_2-M_xO_y):Tb(bpy)_2^<3+> composite phosphors was dependent on the kind and content of metal oxide component in the matrices and maximized at the matrix composition of Si:M=9:1 in molar ratio in either case. In particular, for the SiO_2-Ta_2O_5 matrix system with the composition of Si:Ta=9:1, the complex was incorporated into the host media at concentrations up to 20 mol%, which resulted in composite phosphors with a good transparency. Under the optimized preparation conditons, the emission intensity of such organically modified ceramic (ORMOCER) (SiO_2-Ta_2O_5):Tb(bpy)_2^<3+> phosphors maximized at ca. 75% vs. LaPO_4:Ce, Tb(a commercially available lamp phosphor as the standard substance) with complex concentrations of 10-15 mol%.
社団法人日本セラミックス協会の論文
2000-04-01