Silica gel luminophor containing 1,10-phenanthroline complex with europium m-methylbenzoate, Eu(m-MBA) 3phen·H 2O was prepared by a sol-gel method. The the- rmal decomposition, excitation and emission spectra of the gel phosphor were measured and compared with that of the solid complex powder. The thermal st ability of the complex was found enhanced in SiO 2 host matrix and the luminescence intensity remained unchanged.
Luminescent terbium doped yttrium aluminum garnet (YAG∶Tb) powders were prepared using yttrium and aluminum oxide precursor particles produced by combustion process with glycine. Heat treatment of the resulting precursor powders at 950℃or 1450℃for 2h, yielded pure YAG particles. The morphology of YAG∶Yb phosphor after sintering at 1450℃appeared to be spherical or elliptical and the grain size of the phosphor was in the range of 0.6 to 1.4μm. From the photoluminescence spectra, transitions 5D4 7FJ corresponding to Tb3+in YAG matrices were identified. The prominent transition 5D4 7F6 emission for YAG∶0.05Tb phosphor after sintering at 1450℃was very significant to improve the chromaticity of YAG∶Tb phosphor.
Silica gel luminophors containing 1, l O-phenanthroline-tris(m-methylbenzoate) europium (or terbium) complexes were prepared by sol-gel method. The thermal decomposition, excitation and emission spectra for the gel phosphors were measured and compared with that of solid complex powders. The thermal stability of the complexes was enhanced in SiO2 host matrix and the luminescence intensity remained unchanged.
