We report an experimental study on the photoluminescence band peaked at 2.7 eV (blue band) induced bythermal treatments in nanometric amorphous SiO2. In particular the emission dependence on the nanometricparticles size as a function of their mean diameter from 7 nm up to 40 nm is investigated. We found that theemission amplitude increases on decreasing the particle diameter, showing a strong correlation between theblue band and the nanometric nature of the particles. By Raman spectroscopy measurements it is evidencedthat the SiO2 nanoparticles matrix is significantly affected by the reduction of size. Basing on the shell-likemodel, these findings are interpreted assuming that the defects responsible for the photoluminescence arelocalized on a surface shell of the particles and not simply on their surface. In addition it is found that thegeneration efficiency of these defects depends on the structural properties of the SiO2 matrix in the surfaceshell.
|Numero di pagine||4|
|Rivista||Journal of Non-Crystalline Solids|
|Stato di pubblicazione||Published - 2011|
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