J. Phys. I France 3 (1993) 855-862
Anomalous excitation profile and its relationship to multiple dopant sites in (Nd, Cr) YAlO 3P. R. Nelson, L. Lou, G. Boulon, C. Garapon and C. Pedrini
Laboratoire de Physico-Chimie des Matériaux Luminescents, Université Claude Bernard Lyon 1, 43 Boulevard du 11 novembre 1918, 69622 Villeurbanne Cedex, France
(Received 17 August 1992, accepted 23 October 1992)
Excitation spectra of (Nd 3+, Cr 3+)YAlO 3 are presented which show anomalous profiles. We demonstrate that these anomalous lineshapes can be explained by a combination of three physical mechanisms: the existence of several inequivalent Nd sites, the existence of significant energy transfer from Cr 3+ to Nd 3+ and strong absorption of the excitation beam by Nd 3+ ions. Reasons for residual asymmetry in excitation profiles are discussed with particular emphasis on a Fano effect.
78.50 - 78.55
© Les Editions de Physique 1993