Annina Aebischer, Marc Hostettler, Jürg Hauser, Karl Krämer, Thomas Weber, Hans Ulrich Güdel and Hans-Beat Bürgi
Structural and Spectroscopic Characterization of Active Sites in a Family of Light-Emitting Sodium Lanthanide Tetrafluorides
Angew. Chem. 118, 2869-2873 (2006)                       
Angew. Chem. Int. Ed. 45, 2802-2806 (2006)                       

Abstract: (Article without Abstract)
Graphical Abstract: Illuminating disorder: Many highly efficient light emitters are members of the family b-NaLnF₄ (Ln=Y, La-Lu). Diffuse X-ray scattering is combined with single-crystal absorption spectroscopy at cryogenic temperatures to unambiguously identify and characterize two crystallographically inequivalent spectroscopic sites (A and B). The high light yield is correlated with the existence and nature of these sites.