Enhancement of the emission from SrTiO3:Pr3+ by addition of group-IIIb ions (IIIb3+) has been investigated. From the photoluminescence (PL) spectra and x-ray diffraction patterns, it is speculated that one of the origins of the enhancement is charge compensation of Pr3+ at the Sr2+ site by IIIb3+ substituting for Ti4+ around Pr3+, which results in a change in the crystal field around Pr3+. The IIIb3+-dependent PL spectra can be explained qualitatively by a local distortion around Pr3+ ions due to a difference in an ionic radius between Ti4+ and IIIb3+.
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Okamoto et al. (2001) studied this question.
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