Nd3+-doped potassium niobate (K(1-x)NbO3:Nd-(x)(3+)) polycrystalline powder phosphors for x=0.01, 0.03, 0.05, and 0.07 mol were prepared by the conventional solid-state reaction method and were characterized by X-ray diffraction (XRD), field-emission-scanning electron microscopy, transmission electron microscopy, and photoluminescence measurements. The XRD data have shown a single-phase orthorhombic structure for x=0.01 and 0.03 mol concentrations of Nd3+ ions, while an additional NdNbO4 phase is observed at higher concentrations. The photoluminescence spectrum has shown an intense emission band at 1061 nm along with two weak emission bands at 881 and 1343 nm when the samples are excited with 514.5 nm radiation of an Ar+-ion laser. No drastic changes in the intensity of emissions are observed with concentration variation, except slight changes in the intensities and peak positions of crystal-field peaks.