In order to realize the application of up-conversion materials in solar cells,NaYF4:Er/Yb up-conversion materials were fabricated by hydrothermal method.In this paper,effect of organic solvent and chelating on the properties of materials was concerned.The results indicated that the addition of ethanol effectively inhibit the appearance of YF3 and EDTA make up conversion particles more scattering,which can enlarge the surface area of up conversion materials.NaYF4:Er/Yb up-conversion material with hexagonal p...