Synthesis and characterization of monodispersed BaSO4/Y2O3:Eu3+ core–shell submicrospheres

Spherical BaSO4 particles have been coated with Y2O3:Eu3+ phosphor layers (BaSO4/Y2O3:Eu3+) by the wet chemical method. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dipersive spectroscopy (EDS), photoluminescence spectra were utilized to characterize the BaSO4/Y2O3:Eu3+ core–shell-structured phosphor particles. The obtained core–shell phosphors consist of well dispersed submicron spherical particles with narrow size distribution. XRD result shows that no reaction occurred between the BaSO4 cores and the Y2O3:Eu3+ shells even after annealing at 1400 °C. TEM and EDS results show that BaSO4 particles are well coated with the shell of Y2O3:Eu3+. The BaSO4/Y2O3:Eu3+ core–shell particles show a red emission corresponding to 5D0−7F2 of Eu3+ under the excitation of ultraviolet.