Disorder and the optical spectroscopy of Cr3+-doped glasses: I. Silicate glasses

F. Rasheed, K. P. O'Donnell, B. Henderson, D. B. Hallis

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This paper reports optical absorption and luminescence studies of Cr 3+-doped silicate glasses with compositions chosen to vary the octahedral crystal-field splitting at the Cr3+ site. The extensive site-to-site disorder in the glasses is signalled by the inhomogeneous broadening of radiative transitions and by non-exponential fluorescence decay patterns. Laser-excited luminescence shows that the octahedral crystal-field splitting Dq varies between the different sites occupied by Cr3+ ions. Both R-line and 4T2 to 4A2 emissions are inhomogeneously broadened by site-to-site disorder. Fluorescence line narrowing (FLN) of the R line gives a particularly dramatic demonstration of the site multiplicity. Measurement of the width of the FLN component of the R line as a function of temperature has been used to probe the density of two-level vibrational systems coupled to the electronic levels of the Cr 3+ ion.

Original languageEnglish
Article number022
Pages (from-to)1915-1930
Number of pages16
JournalJournal of Physics: Condensed Matter
Issue number12
Publication statusPublished - 1 Dec 1991


  • optical spectroscopy
  • silicate glasses
  • optical adsorption
  • luminescence


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