Emission enhancement from BaTiO3:Pr3+ by addition of trivalent ion under excitation above the fundamental absorption edge of BaTiO3 host crystals has been investigated. In this system, energy transfer occurs from BaTiO3 to Pr3+. Emission of Pr3+ is intensified by addition of small trivalent ions, e.g., Yb3+ or Sc3+, which substitutes for Ti4+ site, while it is hardly changed by addition of La3+ or Nd3+, which is larger in the ionic radius and substitutes for Ba2+ site. Moreover, smaller difference in ionic radius between the added trivalent ions and Ti4+ induces larger ratio of D21→H43 emission intensity to P03→H43 emission intensity. Addition of Ga3+ gives the largest ratio and the D21→H43 emission intensity among the trivalent ions. These observations demonstrate that one of the origins of the emission enhancement is charge compensation of Pr3+ at the Ba2+ site by the trivalent ion substituting for Ti4+ around the Pr3+, and the emission from BaTiO3:Pr3+ can be controlled by the ionic radius of the added trivalent ion.
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Okamoto et al. (2002) studied this question.
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