Synthesis of SiO2/Y2O3:Eu core-shell materials and hollow spheres |
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| Authors: | Guixia Liu |
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| Institution: | Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China |
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| Abstract: | The SiO2/Y2O3:Eu core-shell materials and hollow spheres were first synthesized by a template-mediated method. X-ray diffraction patterns indicated that the broadened diffraction peaks result from nanocrystals of Y2O3:Eu shells and hollow spheres. X-ray photoelectron spectra showed that the Y2O3:Eu shells are linked with silica cores by Si-O-Y chemical bond. SEM and TEM observations showed that the size of SiO2/Y2O3:Eu core-shell structure is in the range of 140-180 nm, and the thickness of Y2O3:Eu hollow spherical shell is about 20-40 nm. The photoluminescence spectra of SiO2/Y2O3:Eu core-shell materials and Y2O3:Eu hollow spheres have better red luminescent properties, and the broadened emission bands came from the size effects of nanocrystals composed of Y2O3:Eu shell. |
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| Keywords: | Y2O3:Eu Core-shell Hollow spheres Luminescence properties |
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