Investigation of optical properties of YVO_4-Er~(3+) nano-phosphors at different Er~(3+) concentrations and calcination temperatures

摘要

In the present work YVO_4:Er~(3+) nano phosphors are synthesized for different concentrations of erbium and at different calcination temperatures. X-ray diffraction, Fourier transform infrared spectroscopy, UV-visible spectroscopy and photoluminescence (PL) spectroscopy are used for the characterization of the YVO4: Eu~(3+) nano- phosphors. It is observed that the crystallite size decreases with the rise in the erbium concentration and increases with the calcination temperature. The phosphor synthesized at 2 mol % exhibit sharp peaks with maximum intensity, when excited with 325 nm. The PL study at different calcination temperature shows that the luminescence properties of nano phosphors are improving with the rise of calcination temperature. The study concludes that up to 2 mol % concentration of erbium, the luminescence intensity rises, then decreases for further increase in the erbium concentration. The results are useful for understanding the role of the Er concentration in YVO_4 host. Also it concludes strong emission at prolonged temperature and is suitable candidate for the display applications.