Effect of Synthesis Methods on Structural, Optical and Spectral Properties of Bluish-Green LiZnVO4 Phosphor

In this work, synthesis and characterization of LiZnVO4 phosphor prepared by solid state and combustion methods are reported. The synthesized phosphors were characterized by X-ray diffraction (XRD), Photoluminescence, FTIR and Absorption spectra. The phosphors exhibited a single phase, and all the peaks were found to represent a trigonal LiZnVO4 phase. The average crystallite size of the phosphor is found to be 67 nm and 41 nm synthesized via solid state and combustion methods, respectively. FTIR spectra exhibit the absorption bands for Zn-O vibrations and V-O vibration modes of LiZnVO4. The excitation spectra of the phosphor were measured at 550 nm emission wavelength. The excitation spectrum consists of a broad excitation band centered at 270 nm. This band is because of a charge transfer from the oxygen ligands (O2-) to the central vanadium atom (V5+) which corresponds to (1)A(1) -> T-1(1) transition of the vanadium ion. The inaccuracy in the energy band gap of the phosphor synthesized by solid state method was +/- 0.02% from 2.82 eV and that from combustion method was +/- 0.03% from 3.23 eV.