Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5441431 | Journal of Non-Crystalline Solids | 2017 | 6 Pages |
Abstract
SiO2:Eu3 + based free-crack transparent bulk composites containing two types of semiconductor nanoparticles (SnO2 or ZnO) were synthesized by sol-gel process. The results of vibrational spectra (Raman, FT-IR), X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM) indicate that the SiO2-SnO2 matrix possess the structure of a glass-ceramic due to the presence of SnO2 nanocrystals with average size of 7 ± 2 nm homogeneously distributed in silica matrix whereas the SiO2-ZnO still remain amorphous structure after a heat treatment at 600 °C for 1 h. The energy transfer from nanoparticles to Eu3 + ions is observed in both composites, but this process is more efficient in the glass-ceramic systems. Moreover, the competition between magnetic dipole and electric dipole transitions of Eu3 + as well as the shape of emission bands depends strongly on the structure of host matrix.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
T.T. Van Tran, T.M. Dung Cao, Quang Vinh Lam, Van Hieu Le,