Tunnelling between excited 4T2 and 2E states of Cr3+ ions with small energy separation-the case of GSGG

M Yamaga, B Henderson, K P O'Donnell

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A model of 2E to 4T2 tunnelling induced by zero-point vibrations is developed to account for the observed temperature dependence in the photoluminescence spectrum of Cr3+ ions in crystals with small energy separation Delta E=E(2E)-E(4T 2). The model gives good agreement with experimental results for Cr3+ -doped Gd3Sc2Ga3O12, where Delta E=70 cm-1 is smaller than the mean phonon energy h(cross) omega approximately=180 cm-1.

Original languageEnglish
Pages (from-to)9175-9182
Number of pages8
JournalJournal of Physics: Condensed Matter
Issue number46
Publication statusPublished - 20 Nov 1989


  • photoluminescence
  • crystals
  • small energy separation


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