The luminescence spectra of CaO and SrO activated with Pb2+ or Bi3+ ions show vibrational structure. The features in the spectra are discussed by considering the PbO (BiO ) octahedron as an isolated unit in the rocksalt lattice. The luminescence spectra of Tl+‐activated CaO and SrO do not show vibrational structure. Comparisons are made with other s2 ion‐activated systems.
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Steen et al. (1981) studied this question.
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