1. Department
of Chemistry, University of Munich (LMU), Butenandtstrasse 5-13 (D), 81377 Munich, Germany
2. Institute for Mineralogy, Crystallography,
and Materials Science, Leipzig University, Scharnhorststrasse 20, 04275
Leipzig, Germany
3. Philips Technologie GmbH Lumileds Development Center Aachen, Philipsstrasse
8, 52068 Aachen, Germany