Photoluminescence Imaging of SiO2@Y2O3:Eu(III) and SiO2@Y2O3:Tb(III) Core-Shell Nanostructures

We uniformly coated Eu(III)- and Tb(III)-doped yttrium oxide onto the surface of SiO 2 spheres and then characterized them by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction crystallography and UV-Visible absorption. 2D and 3D photoluminescence image map profiles were reported for the core-shell type structure. Red emission peaks of Eu(III) were observed between 580 to 730 nm and assigned to 5 D 0 → 7 F J (J = 0 – 4) transitions. The green emission peaks of Tb(III) between 450 and 650 nm were attributed to the 5 D 4 → 7 F J (J = 6, 5, 4, 3) transitions. For annealed samples, Eu(III) ions were embedded at a C 2 symmetry site in Y 2 O 3 , which was accompanied by an increase in luminescence intensity and redness, while Tb(III) was changed to Tb(IV), which resulted in no green emission. KCI Citation Count: 20