Structural and photoluminescence investigation of Gd3+ doped ZnWO4 phosphor for cyan emitting lighting applications

In the present paper we have reported the effect of doping Gd3+ ion at 1% molar concentration in ZnWO4 phosphor for structural, microstructural and optical studies. The undoped and doped ZnWO4 samples are prepared by using the solid-state reaction route. The structural phase and lattice parameters of the prepared phosphors has been examined using X-ray diffraction (XRD) analysis. Raman studies indicate experimental evidence of Gd3+ ions in the host matrix. The frequency downconversion (DC) emission spectra of the prepared samples has been observed in the 300 nm to 800 nm wavelength region using ultra-violet (UV) laser source of 325 nm excitation. The emission spectra corresponding to the possible vacancies created in the host is depicted using a energy level diagram. The colour coordinates and purity percentage of the doped compound is evaluated in the present study using Commission Internationale de I’ ėclairage (CIE) chromaticity diagram. The present investigation reflects potential applications of the prepared phosphors in cyan emitting lighting applications.