Fluorescence Study of Eu-YVO4 Nano-Phosphors as a Function of Calcination Temperature and Excitation Wavelengths

Nano phosphors have been prepared with 1 mol% and 5 mol% doping of Eu in vanadate by sol-gel method. X-ray pattern indicated that nano phosphors did not lead to phase change and has tetragonal crystal structure. Excitation spectra revealed that the band at 308 nm arises due to the charge transfer transitions among Eu(3+) and VO4 (3-) ions. The peak position of fluorescence shifted from 518 to 638 nm on varying the excitation wavelength from 257 nm to 318 nm. It is also noticed that the fluorescence intensity increases with the rise of calcination temperatures of the samples.