The visible luminescence of Pr3+
and Tm3+
ions in lead borate glasses has been investigated as a function of activator
concentration. The Judd–Ofelt analysis and the Inokuti–Hirayama model for
energy transfer between activator ions have been applied for investigations of the
radiative and non-radiative relaxation of the Pr and Tm excited states. Based
on the luminescence decay curve analysis, the concentration quenching of the
1D2 emission
of Pr3+ and
1G4 emission
of Tm3+
ions has been attributed to cross-relaxation processes. The infrared spectroscopic
measurements provide information on structural changes in the borate network
initiated by optically active (Pr or Tm) ions. Contrary to the praseodymium
ions, the thulium ions play an additional role as a glass-modifier in the
PbO–B2O–Al2O3–WO3
composition.
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