Abstract
The structural and spectroscopic properties of
Na<sub>2</sub>O-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2-x</sub>P<sub>2</sub>O<sub>5</sub>
glasses (x=0 to 7 mol%) are investigated. Both Raman and IR spectra reveal that
discrete phosphate species ([PO<sub>4</sub><sup>-3</sup>,
[PO<sub>3</sub>O<sub>1/2</sub>]<sup>-2</sup>) with low polymerization degree can
be formed in the silicate glass. These phosphate structures scavenge non-bridging
oxygen ions and cations from the silicate network, resulting in an increase of the
glass transition temperature. According to the Judd-Ofelt intensity parameters
(Ω<sub>2</sub>, Ω<sub>4</sub>, Ω<sub>6</sub>) of
Er<sup>3+</sup>, the asymmetry of local environment around Er<sup>3+</sup>
becomes higher, and the bond covalency between Er<sup>3+</sup> and O<sup>2-</sup>
decreases after P<sub>2</sub>O<sub>5</sub> is introduced. In the emission spectra,
photoluminescence intensity increases with increasing P<sub>2</sub>O<sub>5</sub>
concentration and the spectra are inhomogeneously broadened, revealing that the
ligand electric field around Er<sup>3+</sup> is dramatically changed, and the glass
matrix becomes disordered.
© 2012 Chinese Optics Letters
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription