Fabrication, magnetic and luminescent properties of CoFe2O4@SiO2@Y2O3:Dy3+ composites

Depositing the luminescent Y2O3:Dy3+ onto the surface of ferrimagnetic CoFe2O4@SiO2 composites obtains the difunctional CoFe2O4@SiO2@Y2O3:Dy3+ nanoparticles. In spite to keeping the yellow luminescence property (4F9/2 → 6H13/2 in 572 nm), the nanoparticles display the strongest luminescent intensity at 600 °C of calcination temperature due to the influence of ferrimagnetic CoFe2O4 particles. The increasing of maturation magnetization (Ms) and the nearly unchanging of coercivity (Hc) in the nanoparticles with the increasing calcination temperature can be contribute to the increasing of CoFe2O4 particles size. By altering annealing temperature, the mass rate of Y2O3:Dy3+ over CoFe2O4@SiO2, and the doping concentration of Dy3+, the size, the magnetic, and luminescence properties of nanoparticles can be controlled.