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

Bulletin of the Korean chemical society

Insu Cho¹  Jun-Gill Kang¹  Youngku Sohn¹ 

关键词: SiO2@Eu(III)-Y2O3;    SiO2@Tb(III)-Y2O3;    Core-shell;    Site symmetry;    Photoluminescence imaging;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

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.

【 授权许可】

Unknown