Trivalent rare earths, fluorescent lifetimes

Fluorescent lifetimes of trivalent rare earth transition metal chemistry. G. E. Peterson, Transition Met. Chem. (N.Y.), 1966, 3, 202-302 (173). 

As was stated in Sec. I. A, no attempt has been made to include all known measurements of the fluorescent lifetimes of the trivalent rare earths. However, a reasonable effort was made to include a substantial number of the papers on this topic published during the last few years. The criteria of eliminating some papers in which a casual measurement was made was adhered to, and in other cases a language barrier unfortunately prohibited their inclusion. Consequently, this review is representative rather than exhaustive. 

Axe and Weller (52) studied fluorescence and energy transfer of europium in yttrium oxide. In an experiment somewhat similar to that of Peterson and Bridenbaugh (54) on terbium, Axe and Weller were able to obtain experimental evidence for nonradiative-energy transfer between europium and other trivalent rare earth ions. Their study included both intensity and fluorescent-lifetime measurements. 

This review will be concerned with fluorescent-lifetime studies upon condensed systems (that is, glasses, liquids, or crystals) containing rare-earth ions, and will to a large extent deal only with trivalent ions pumped by optical means. Laser phenomena themselves will not be considered, because a number of very excellent review articles (5-7) and books (8, 9) already exist on this subject. 

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