Photoluminescence Imaging of SiO2@Y2O3:Eu(III) and SiO2@Y2O3:Tb(III) Core-Shell Nanostructures
- Photoluminescence Imaging of SiO2@Y2O3:Eu(III) and SiO2@Y2O3:Tb(III) Core-Shell Nanostructures
- 손영구; 조인수; 강준길[강준길]
- LUMINESCENCE PROPERTIES; PHOSPHOR MATERIALS; TB3+; NANOCRYSTALS; PARTICLES; NANOSPHERES; EUROPIUM; SPHERES; SIO2
- Issue Date
- KOREAN CHEMICAL SOC
- BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.35, no.2, pp.575 - 580
- We uniformly coated Eu(III)- and Tb(III)-doped yttrium oxide onto the surface of SiO2 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 D-5(0) -> F-7(J) (J=0-4) transitions. The green emission peaks of Tb(III) between 450 and 650 nm were attributed to the D-5(4) -> F-7(J) (J = 6, 5, 4, 3) transitions. For annealed samples, Eu(III) ions were embedded at a C-2 symmetry site in Y2O3, 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.
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