Abstract
Vibronic transitions in the emission and excitation spectra of Pr 3+ in REOCl (RE = Y, La) are reported. The influence of the Pr 3+ concentration on the vibronic spectra of Pr 3+ is investigated for La 1− x Pr x OCl ( x⩽0.1). Concentration enhancement of the vibronic transitions is observed in the excitation spectra only. This phenomenon is ascribed to the superexchange interaction between Pr 3+ ions over distances of about 8 Å. Evidence that the vibronic transition probability A VIB for the 3H 4 1,2 ← 3P 0 transition of Pr 3+ in LaOCl is the same in emission and excitation is presented. The values of A VIB for this transition are larger in YOCl:Pr 3+ than in LaOCl:Pr 3+, and scale with the transition probabilities for the zero-phonon lines. This suggests that the Δ-process contribution to the vibronic coupling strength dominates. The observed vibronic spectra of Pr 3+ in REOCl give increased support for this suggestion.
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