Study on Luminescent Properties of Eu³⁺ Doped New Type Yttrium Tungsten Oxide Nanophosphors

In this paper, a novel nanophosphor, Y₁₀W₂O₂₁:Eu, was synthesized through co-precipitation which is a simple and low-costing method. The structure and morphology of the nanocrystal samples were characterized by using XRD and FE-SEM. The emission spectra, excitation spectra and fluorescence decay curves were measured. J–O parameters, quantum efficiencies of Eu^{3+ 5}D₀ energy level, color coordinates and Huang-Rhys factor of Y₁₀W₂O₂₁:Eu nanophosphors were calculated. The results indicate that Eu^{3+ 5}D₀–⁷F₂ red luminescence at 610 nm can be effectively excited by 394 nm near-UV light and 464 nm blue light in Y₁₀W₂O₂₁ host, which is similar to the familiar Eu³⁺ doped tungstate phosphors (e.g., Gd₂(WO₄)₃:Eu, CaWO₄:Eu). Besides, compared with the other types of tungstate phosphors, a less expensive tungsten was used, which can effectively reduce cost. Therefore, the Y₁₀W₂O₂₁:Eu red nanophosphors may have a potential application for white LED.