Abstract
The visible luminescence of Pr3+ and Tm3+ ions in lead borate glasses has been investigated as a function of activatorconcentration. The Judd–Ofelt analysis and the Inokuti–Hirayama model forenergy transfer between activator ions have been applied for investigations of theradiative and non-radiative relaxation of the Pr and Tm excited states. Basedon the luminescence decay curve analysis, the concentration quenching of the1D2 emissionof Pr3+ and1G4 emissionof Tm3+ ions has been attributed to cross-relaxation processes. The infrared spectroscopicmeasurements provide information on structural changes in the borate networkinitiated by optically active (Pr or Tm) ions. Contrary to the praseodymiumions, the thulium ions play an additional role as a glass-modifier in thePbO–B2O–Al2O3–WO3 composition.
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