均一沈殿法によるLaPO_4:Tb,Ce蛍光体の形態制御

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LaPO4: Ce,Tb particles were prepared by precipitation from homogeneous solution using urea and hexamethylenetetramine (HMT). Effects of increasing molar concentration of cation and anion, adding hydroxylic carboxylic acid on the morphology and photoluminescence properties of LaPO4: Ce, Tb phosphor were investigated. Prepared LaPO4 was hydrate. The particles were needle-like shaped when using urea as a precipitant and rod shaped when using HMT. Both particle lengths were about 2 μm. Increasing molar concentration of H3PO4, the formed particles were smaller than that synthesized by the stoichiometric ratio and strongly agglomerated. Adding hydroxylic carboxylic acid as additives, the morphology of particles turned into various form such as spherical, cubic, rectangular and cross shape. However the morphology of LaPO4: Ce, Tb phosphor was not homogeneous because of the morphology of TbPO4 and CePO4 which were bonding rod and cone. The prepared LaPO4: Ce, Tb phosphor showed strong green emission by UV excitation. The luminescence intensity was stronger when using urea rather than HMT.
2009-10-15