The excitation and emission properties of Pr3+ and Tb3+ ions doped into YNbO4 (hereafter YNB) and CaNb2O6 ( hereafter CNB) have been studied as a function of the temperature in the 10-600 K range. The observed quenching of the luminescence from the P-3(0) (Pr3+) and D-5(3) (Tb3+) states has been related to an electron transfer process from the trivalent rare earth to the Nb5+ ion inducing the formation of an intervalence charge transfer (IVCT) state. On this basis a detailed picture of the excited-state dynamics of the investigated compounds is presented, taking into account the characteristics of the host lattices and of the involved optically active ions.
Emission quenching induced by intervalence charge transfer in Pr3+ or Tb3+ doped YNbO4 and CaNb2O6
BETTINELLI, Marco Giovanni
2007-01-01
Abstract
The excitation and emission properties of Pr3+ and Tb3+ ions doped into YNbO4 (hereafter YNB) and CaNb2O6 ( hereafter CNB) have been studied as a function of the temperature in the 10-600 K range. The observed quenching of the luminescence from the P-3(0) (Pr3+) and D-5(3) (Tb3+) states has been related to an electron transfer process from the trivalent rare earth to the Nb5+ ion inducing the formation of an intervalence charge transfer (IVCT) state. On this basis a detailed picture of the excited-state dynamics of the investigated compounds is presented, taking into account the characteristics of the host lattices and of the involved optically active ions.
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