Sol–gel growth of Gd 2MoO 6:Eu 3+ nanocrystalline layers on SiO 2 spheres (SiO 2@Gd 2MoO 6:Eu 3+) and their luminescent properties

Abstract

SiO 2@Gd 2MoO 6:Eu 3+ core–shell phosphors were prepared by the sol–gel process. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectra (EDS), transmission electron microscopy (TEM), photoluminescence (PL) spectra as well as kinetic decays were used to characterize the resulting SiO 2@Gd 2MoO 6:Eu 3+ core–shell phosphors. The XRD results demonstrate that the Gd 2MoO 6:Eu 3+ layers on the SiO 2 spheres begin to crystallize after annealing at 600 °C and the crystallinity increases with raising the annealing temperature. The obtained core–shell phosphors have a near perfect spherical shape with narrow size distribution (average size ca. 600 nm), are not agglomerated, and have a smooth surface. The thickness of the Gd 2MoO 6:Eu 3+ shells on the SiO 2 cores could be easily tailored by varying the number of deposition cycles (50 nm for four deposition cycles). The Eu 3+ shows a strong PL luminescence (dominated by 5D 0– 7F 2 red emission at 613 nm) under the excitation of 307 nm UV light. The PL intensity of Eu 3+ increases with increasing the annealing temperature and the number of coating cycles.