1. Institute of General, Inorganic, and Theoretical Chemistry, University of Innsbruck, Innrain 80-82, A-6020 Innsbruck, Austria
2. OSRAM Opto Semiconductors GmbH, Mittelstetter Weg 2, D-86830 Schwabmünchen, Germany
3. OSRAM Opto Semiconductors GmbH, Leibnizstrasse 4, D-93055 Regensburg, Germany