The unusual temperature dependence of the Eu$^{2+}$ fluorescence lifetime in CaF$_2$ crystals

Details The unusual temperature dependence of the Eu$^{2+}$ fluorescence lifetime in CaF$_2$ crystals The unusual temperature dependence of the Eu$^{2+}$ fluorescence lifetime in CaF$_2$ crystals

2005-05-24

arxiv.org/abs/cond-mat/0505592v1

Physics

Condensed Matter

Materials Science

10 pages, 2 figures, to appear on Journal of Alloys and Compounds

Scientific paper

10.1016/j.jallcom.2005.01.077

Fluorescence lifetimes of Eu$^{2+}$ doped in CaF$_2$ are measured at various temperatures between 4K and 450K. The lifetime increases with between 100K and 300K, in contrast to the usual lifetime-temperature dependence. At higher or lower temperatures the lifetime decreases with increasing temperature. The phenomenon is explained by simulation of the energy levels and lifetimes of low-lying $4f^65d$ states involved in the fluorescence.

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