Luminescent properties and characterization of Gd_2O_3: Eu~(3+)@SiO_2 and Gd_2O_3 Ti_2O_7: Eu~(3+)@SiO_2 core-shell phosphors prepared by a sol-gel process

摘要

Gd2O3:Eu~(3+) and Gd_2Ti_2O_7:Eu~(3+) films 10 nm in thickness were individually coated onto silica spheres (particle size of 150-170 nm) using the sol-gel method. The synthesized materials were addressed as Gd_2O_3:Eu~(3+)@SiO_2 and Gd_2Ti_2G_7:Eu~(3+)@SiO_2 phosphors. An x-ray powder diffractometer (XRD), field emission scanning electron microscope (FE-SEM), high-resolution transmission electron microscope (HR-TEM), and photoluminescence spectrophotometer (PL) were employed to characterize the core-shell phosphors. Uniform core-shell phosphor particles were observed using FE-SEM. The XRD and HR-TEM results indicated that the coated-shell layer was well crystallized after sintering at 1000 °C. The Gd_2Ti_2G_7:Eu~(3+)@SiO_2 PL measurement showed a red emission at the main 615 nm wavelength. The Gd_2Ti_2G_7:Eu~(3+)@SiO_2phosphor showed an orange-red emission at the 588 and 615 nm wavelengths. In comparison with the Gd_2O_3:Eu~(3+) and Gd_2Ti_2G_7:Eu~(3+)@SiO_2 bulk material results, the core-shell phosphors maintained the same emission ability as the bulk materials and the novel core-shell phosphors possessed great potential in quantum phosphor applications.