Department of Optical Spectroscopy Seminar
sala nr 6, bud. II
The intensities of the f ↔ f transitions of trivalent lanthanide ions
Prof. Marco Bettinelli
Luminescent Materials Laboratory, Department of Biotechnology, University of Verona, Italy
The intensities of the f ↔ f transitions of trivalent lanthanide ions have been discussed many times in the scientific literature (e. g. in R. D. Peacock, Structure and Bonding, 22 (1975) 83-122). In this talk, the relative intensities of the 5D0→7FJ (J=0, 1, 2, 4) transitions of Eu3+ in crystalline hosts will be considered. Several examples, taken from my research work, will be described, showing an uncommon or unexpected behaviour of the observed relative intensities of the 5D0→7FJ transitions. The reasons for these anomalies will be presented and discussed on the basis of existing theories. The local structure at the Eu3+ ion, the presence of disorder, the ligand polarizability and the effect of vibronic coupling are found to be responsible for the observed behaviour.
