1. IBM Research − Zurich, Säumerstrasse 4, CH-8803 Rüschlikon, Switzerland
2. Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700 Fribourg, Switzerland
3. Photophysics and OptoElectronics, Zernike Institute of Advanced Materials, University of Groningen, Groningen 9747, The Netherlands
4. Macromolecular Chemistry, Bergische Universität Wuppertal, Gauss-Str. 20, D-42119 Wuppertal, Germany