1. Department of ChemistryLudwig Maximilians University Munich Butenandtstr. 5–13 81377 München Germany
2. Institute for Mineralogy, Crystallography and Materials ScienceLeipzig University Scharnhorststr. 20 04275 Leipzig Germany
3. ESRF—The European Synchrotron 71 avenue des Martyrs 38000 Grenoble France
4. Lumileds Phosphor Center Aachen (LPCA)Lumileds (Germany) GmbH Philipsstr- 8 52068 Aachen Germany