Upconversion luminescence of cerium doped CoWO(4) nanomaterials

Abstract

In this paper we report the bluish green upconversion intrinsic photoluminescence (PL) observed at room temperature (RT) 300 K for the nanorange (27-50 nm) Ce3+ doped and undoped CoWO(4) powder samples sintered in air at 600 degrees C. Excitation by Xenon lamp at 600 nm was done and the emission was observed between 400 nm and 550 nm. Co(1-x)Ce(x)WO(4) [where x=0.00, 0.02, and 0.03] compounds were prepared by the solution based co-precipitation method and characterised by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The surface morphology of the compounds was examined by scanning electron microscopy (SEM) techniques. Optical absorption and photoluminescence behaviour of the compounds in the rigid matrix were studied. High emission intensity and easy preparation make these systems potential candidates for application as luminescent materials.