Pressure effect on the structure and the luminescence of rare-earth ions doped glasses: an investigation by molecular dynamics simulation

Molecular dynamics simulation has been used to study the effect of hydrosta tic pressure on the structural and spectroscopic properties of Eu3+-doped N a2O . 2SiO(2) glass. The short- and medium-range order has been investigate d. The evolution of angular and radial distribution has shown the dependenc e of the structure with pressure. It was found that pressure induces an inc rease of the coordination number of the Eu3+ ion and a shortening in the Eu -O bond distance. The pressure effects on the crystal-field parameters and on the luminescent spectra are computed and discussed in comparison with ex perimental data. (C) 2000 Elsevier Science B.V. All rights reserved.