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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 35, Number 2
BKCSDE 35(2)
February 20, 2014 

Photoluminescence Imaging of SiO2@Y2O3:Eu(III) and SiO2@Y2O3:Tb(III) Core-Shell Nanostructures
Insu Cho, Jun-Gill Kang*, Youngku Sohn*
SiO2@Eu(III)-Y2O3, SiO2@Tb(III)-Y2O3, Core-shell, Site symmetry, Photoluminescence imaging
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 5D0  7FJ (J = 0 – 4) transitions. The green emission peaks of Tb(III) between 450 and 650 nm were attributed to the 5D4 7FJ (J = 6, 5, 4, 3) transitions. For annealed samples, Eu(III) ions were embedded at a C2 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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