Pressure effect on the stucture and the luminescence of rare-earth doped glasses: an investigation by Molecular Dynamic simulation

Molecular dynamics simulation has been used to study the e!ect of hydrostatic pressure on the structural and spectroscopic properties of Eu>-doped Na O ) 2SiO glass. The short- and medium-range order has been investigated. The evolution of angular and radial distribution has shown the dependence of the structure with pressure. It was found that pressure induces an increase of the coordination number of the Eu3+ ion and a shortening in the Eu3-O bond distance. The pressure e!ects on the crystal-field parameters and on the luminescent spectra are computed and discussed in comparison with experimental data.