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Link between optical spectra, crystal-field parameters, and local environments of Eu3 ions in EuO-doped sodium disilicate glass

Physical Review B - Condensed Matter and Materials Physics, ISSN: 1098-0121, Vol: 84, Issue: 10
2011
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  • Citations
    23
    • Citation Indexes
      23
  • Captures
    23

Article Description

Rare-earth-doped glasses are key materials for optical technology due to the luminescent properties of 4fn ions. The crystal-field model describes the effect of local environment on transitions between 4f electrons. We present a detailed modeling study of the optical spectra of sodium disilicate glass, 33NaO•67SiO, doped with 0.2% and 1.0 mol% Eu O. This study uses very large molecular dynamics models with up to 100 Eu3 ions, the superposition model for covalent and overlap effects on crystal-field parameters, and realistic values for homogeneous linewidth broadening. The simulated spectra are in reasonable agreement with experiment. The trends in 7F energy levels across different Eu3 ion sites have been examined and a very detailed analysis is presented that looks at how features of the spectra are related to features of the local environment of Eu3 ions. Increasing the crystal-field strength S causes the 7F energy level to decrease and causes the splitting of 7F manifolds to increase, and this is due to increasing mixing of 4f wave functions. To a reasonable approximation the crystal-field strength components S depend on angular positions of ligands independently of distances to ligands. The former are seen to be more significant in determining S, which are closely related to the rotationally invariant bond-orientational order parameters Q . The values of S are approximately linear in Q , and the values of Q are higher for fivefold than sixfold coordinated rare-earth ions. These results can be of importance for efforts to enhance the local environment of rare-earth ions in oxide glasses for optical applications. © 2011 American Physical Society.

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