J. Phys. IV France
Volume 119, November 2004
Page(s) 201 - 202

J. Phys. IV France 119 (2004) 201-202

DOI: 10.1051/jp4:2004119057

Synthesis and spectroscopic characterization of Yb 3+ in Ca $_{\rm 1-X}$Yb $_{\rm X}$F $_{\rm 2+X}$ crystals

M. Ito1, C. Goutaudier1, Y. Guyot1, K. Lebbou1, T. Fukuda2 and G. Boulon1

1  Physical Chemistry of Luminescent Materials, Claude Bernard/Lyon1 University, UMR 5620 CNRS, Bât. A. Kastler, 10 rue Ampère, 69622 Villeurbanne Cedex, France
2  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan

Ca $_{\rm 1-X}$Yb $_{\rm X}$F $_{\rm 2+X}$ crystals were grown by two different methods: simple melting under CF 4 atmosphere and laser heated pedestal growth (LHPG) method under Ar atmosphere. Spectroscopic characterization has been carried out to separate different crystallographic site in Ca $_{\rm 1-X}$Yb $_{\rm X}$F $_{\rm 2+X}$ crystals and to identify Stark's levels of Yb 3+ transitions. Experimental decay time dependence of Yb 3+ concentration was analyzed by using concentration gradient fiber in order to understand concentration quenching mechanisms. Energy transfer to unexpected rare earth impurities observed by up-conversion emission spectra in visible region under IR Yb 3+ ion pumping seems to be an efficient process.

© EDP Sciences 2004