Abstract: 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→¹A₁ and ³T₁→¹A₁transition. 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 Zn₃V₂O₈phosphor 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.

Key words: Zn₃V₂O₈, yellow-emitting, wide absorption band, WLED, decay time, electron transition, optical property