Preparation of Yellow-Emitting Pure Zn3V2O8 Phosphors and Its Optical Properties
Yellow-emitting pure Zn3V2O8 phosphors were successfully synthesized via a simple high-temperature solid-state method using BaF2 as heat-assisted co-solvent.The purity of Zn3V2O8 was determined by X-ray diffraction(XRD),and its optical properties were analyzed by PLE/PL spectrum,thermal quenching spectrum and fluorescence lifetime curve analysis.The results show that Zn3V2O8 exhibits strong broadband emission in the range of 400～800 nm under the excitation of 360 nm,which is attributed to 3T2→1 A,and 3T1→A1 transition.Zn3V2O8 can emit bright yellow light and the optimum emission wavelength is 550 nm.Under 550 nm,Zn3V2O8 phosphors show wide absorption bands in the range of 200～450 nm.The decay time of Zn3V2O8 phosphor is 1.67 ms and its inner quantum efficiency reaches 47.09％at room temperature.Moreover,when the temperature rose to 140 ℃,its emission intensity retention could reach 25.1％of its initial intensity at room temperature,which is higher than that of other garnet structure vanadate materials.Therefore,Zn3V2O8 phosphor as a novel yellow light source for white light-emitting diode devices has potential advantages in terms of low cost and the ability to be mass-produced.
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