Fluorescence Properties of Nd~(3+)-Doped KNbO_3 Nano-Phosphors

摘要

Nd~(3+)-doped potassium niobate (K_((1-x)))NbO_3:Nd_x~(3+)(x = 0.01, 0.03, 0.05 and 0.07)) polycrystalline powder nano-phosphors were prepared by the conventional solid state reaction method and were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence measurements. The XRD data has shown single phase orthorhombic structure for x = 0.01 and 0.03 moles of Nd~(3+) ion concentrations while an additional NdNbO_4 phase is observed at higher concentrations of Nd~(3+) ions. The photoluminescence spectrum has shown an intense emission at 1061 nm along with two low intense emission bands at 883 and 1343 nm when the samples were excited with 514.5 nm radiation of an Ar~+ ion laser. No drastic changes of intensity of emissions are observed with concentration variation, except changes in crystal-fields peak intensities.