Hydrothermal Synthesis and Property of Rare Earth of Fluoride NaYF_4:Er~(3+) materials

摘要

High quality NaYF_4 and NaYF_4:Er~(3+) materials were prepared using EDTA-assisted hydrothermal method. The effects of doping of Er~(3+) on the shape of samples were discussed. The samples were characterized by X-ray powder diffraction (XRD), and scanning electron microscopy (SEM). XRD patterns show that the samples are hexagonal phase of NaYF_4 and NaYF_4:Er~(3+) with good crystallization. SEM images present that the samples of NaYF_4 are homogeneous nanorods with a diameter of 342 nm and a length of 1043nm, the NaYF_4:(Er~(3+))_ (5%) sample with a diameter of 180.7nm and a length of 1220nm, and NaYF_4:(Er~(3+))_(10%) with a diameter of 139.4nm and a length of 939.9nm. The sizes of the NaYF_4 and NaYF_4:Er~(3+) nanoparticles are basically consistent with that calculated from XRD peak via the Scherrer equation.