Journal
QUIMICA NOVA
Volume 26, Issue 6, Pages 889-895Publisher
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0100-40422003000600018
Keywords
rare earth ions; photoluminescence spectroscopy; 4f-4f intensities
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In this article we review some of the basic aspects of rare earth spectroscopy applied to vitreous materials. The characteristics of the intra-atomic free ion and ligand field interactions, as well as the formalisms of the forced electric dipole and dynamic coupling mechanisms of 4f-4f intensities, are outlined. The contribution of the later mechanism to the 4f-4f intensities is critically discussed, a point that has been commonly overlooked in the literature of rare earth doped glasses. The observed correlation between the empirical intensity parameter Omega(2) and the covalence of the ion first coordination shell is discussed accordingly to the theoretical predictions.
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