(y = 0.5, 1.0, 1.5%) nanophosphors were synthesized by solvent thermal method. The crystalline structure of samples were characterized by powder X-ray diffraction (XRD) (Bruker D8-Advance diffractometer using Cu Kα (λ = 1.5406 A) radiation). The morphology and particle sizes were determined by a transmission electron microscopy (TEM, JEM-2100). The UC spectra were recorded using a Hitachi F-7000 fluorescence spectrometer with a 980 nm laser diode as excitation source. Absorption spectra were measured by a Hitachi U-4100 UV-vis-NIR spectrophotometer. Raman spectra were performed by using Micro-Raman Spectroscopy System (Renishaw invia). All the measurements were performed at room temperature.