Abstract
Eu-based vanadate Ca 9Eu(VO 4) 7 phosphor was synthesized by the solid state reaction method and was characterized by X-ray powder diffraction (XRD). The photoluminescence excitation and emission spectra, fluorescence decay curves and the dependence of luminescence intensity on temperature were investigated. The phosphor can be efficiently excited by near UV light to realize an intense red luminescence (614 nm) corresponding to the electric dipole transition 5D 0 → 7F 2 of Eu 3+ ions. The crystallographic site-occupations of the Eu 3+ ions in Ca 9Eu(VO 4) 7 were investigated by the site-selective excitation and emission spectra, and the fluorescence decay curves in the 5D 0 → 7F 0 region using a pulsed, tunable, narrowband dye laser. The red luminescence together with the thermal stability was discussed on the base of the Eu 3+ site-distribution in Ca 9Eu(VO 4) 7 host.
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