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http://dx.doi.org/10.5012/bkcs.2014.35.2.575

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

Cho, Insu (Department of Chemistry, Yeungnam University)
Kang, Jun-Gill (Department of Chemistry, Chungnam National University)
Sohn, Youngku (Department of Chemistry, Yeungnam University)
Publication Information
Bulletin of the Korean Chemical Society / v.35, no.2, 2014 , pp. 575-580 More about this Journal
Abstract
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 $^5D_0{\rightarrow}^7F_J$ (J = 0 - 4) transitions. The green emission peaks of Tb(III) between 450 and 650 nm were attributed to the $^5D_4{\rightarrow}^7F_J$ (J = 6, 5, 4, 3) transitions. For annealed samples, Eu(III) ions were embedded at a $C_2$ symmetry site in $Y_2O_3$, 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.
Keywords
$SiO_2$@Eu(III)-$Y_2O_3$; $SiO_2$@Tb(III)-$Y_2O_3$; Core-shell; Site symmetry; Photoluminescence imaging;
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