Synthesis And Fluorescence Properties Of Y₂o₃ :eu³⁺

Rare earth luminescent materials have been widely used in information display and green lighting due to its special electronic structure and profuse energy levels. Among them, Eu³⁺ doped materials as one of the excellent red-emission phosphors have been focused on. Up to date, the commercially available red-emission phosphors is Eu³⁺ doped Y2O2S, which has an bad impact on the environment, hence many research institutes tend to develop Y₂O₃-based materials. On the other hand, because Eu³⁺ doped the Y2O2S is usually synthesized by high temperature solid state reaction, uniform particle size can hardly be obtained. The application of display technique in Field Emission Display(FED), Plasma Display Panel(PDP) request that luminescent materials have suitable microstructure. Based on the two points involved, the influence of doping and microstructure on the luminescence efficiency of Y₂O₃:Eu³⁺ were investigated.In this paper Li+ doped Y₂O₃:Eu³⁺ were synthesized using sol-gel method to investigate the effect of crystal field on the luminescence density. XRD and spectral measurement were employed to observe the effect of the ion concentration on the fluorescence intensity, which gives the optimal doping level. And we find the doping of Li+ ions not only influences the crystal field environment, but also enhances the grain growth, acting as fluxing agent.The relationship between hydrothermal condition and the microstructure of Y₂O₃:Eu³⁺ were also investigated. By comparison, we find that sheet-like morphology tends to be formed at low hydrothermal temperature, while rod-like samples are obtained at high hydrothermal temperature, It is found that the morphology of samples significantly influence the luminescence. High hydrothermal condition can enhance the luminescence, which due to the decrease of non-radiative transitions.