Single crystals of Yb-doped material were grown, using the Czochralski technique, under a CF4 atmosphere. The photoluminescence and decay kinetics of the Yb2+ center in single crystals at 4 to 300K were described. A phenomenological 2 excited-state level model reproduced the quantitative characteristics of the excited state dynamics of the Yb2+ emission center.

Luminescence and Decay Kinetics of Yb2+ in LiCaAlF6 Single Crystal Host. M.Nikl, A.Bensalah, E.Mihokova, J.Hybler, H.Sato, T.Fukuda, G.Boulon: Optical Materials, 2003, 24[1-2], 191-5