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

Novel Y-2(MoO4)(3):Eu3+ 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(MoO4)(3):Eu3+ phosphors, by monitoring 616 nm, the charge transfer bands (CTB) of Eu3+-> O2- and Mo6+-> O2- centering at around 264 and 3 10 nm can be observed, respectively. Moreover, the intensity ratio of charge transfer band between Eu3+-> O2- and Mo6+-> O2- increases with increasing Eu3+ ions doping concentration. The characteristic red emission at around 616 nm of Eu3+ ions is also observed, ascribed to the D-5(0)-> F-7(2), transition of Eu3+ ions, and the optimal doping concentration is 12 mol %. Finally, the Omega(lambda) (lambda=2 and 4) intensity parameters and Huang-Rhys factor were also calculated according to Judd-Ofelt theory and multiphonon relaxation theory, respectively.