Y1-xVO4:Eux 3+ red phosphors were synthesized with changing the mol ratios of Eu3+ ions by using the solid-state reaction method. The crystalline structure of phosphors was found to be a tetragonal system with the maximum diffraction intensity at 25.02°. The grain particles showed the truncated hexagonal patterns with a very homogeneous size distribution at 0.05 mol of Eu3+ ion. The excitation spectra of the phosphor ceramics were composed of a broad band centered at 303 nm and weak narrow multilines peaked in the range of 360-420 nm. The dominant emission spectrum was the strong red emission centered at 619 nm due to the 5D0→7F2 electric dipole transition. The experimental results suggest that the optimum doping mol ratio of Eu3+ ions for preparing the red phosphors is 0.10 mol with the asymmetry ratio of 5.21.

Gd(1-x)VO4:Eu(x)3+ red phosphors were synthesized with changing the concentration of Eu3+ ion by using a solid-state reaction method. The crystal structure, surface morphology, and photoluminescence and photoluminescence excitation properties of the red phosphors were measured by using X-ray diffractometer, field emission-scanning electron microscopy, and florescence spectrometer, respectively. The XRD results showed that the main peak of all the phosphor powders occurs at (200) plane. As for the photoluminescence properties, the maximum excitation spectrum occurred at 306 nm due to the charge transfer band from VO4(3-) to Eu3+ ions and the maximum emission spectrum was the red luminescence peaking at 619 nm when the concentration of Eu3+ ion was 0.10 mol.