Luminescent Properties of Y₂(MoO₄)₃:Eu³⁺ Red Phosphors with Flowerlike Shape Prepared via Coprecipitation Method

Abstract

Novel Y 2 (MoO 4 ) 3:Eu 3+ red phosphors were synthesized through a simple coprecipitation process and characterized by using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and fluorescent spectrophotometry. The results of XRD and FE-SEM show that resultant samples are single phase and have flowerlike shape. In the excitation spectra of Y 2 (MoO 4 ) 3:Eu 3+ phosphors, by monitoring 616 nm, the charge transfer bands (CTB) of Eu 3+ →O 2- and Mo 6+ →O 2- centering at around 264 and 310 nm can be observed, respectively. Moreover, the intensity ratio of charge transfer band between Eu 3+ →O 2- and Mo 6+ →O 2- increases with increasing Eu 3+ ions doping concentration. The characteristic red emission at around 616 nm of Eu 3+ ions is also observed, ascribed to the 5 D 0 → 7 F 2 transition of Eu 3+ ions, and the optimal doping concentration is 12 mol %. Finally, the Ω λ (λ = 2 and 4) intensity parameters and Huang−Rhys factor were also calculated according to Judd−Ofelt theory and multiphonon relaxation theory, respectively.