1. Institute
of Physical Chemistry, University of Hamburg, Grindelallee 117, D-20146 Hamburg, Germany
2. NanoSYD,
Mads Clausen Institute, University of Southern Denmark, Alsion 2, DK-6400 Sønderborg, Denmark
3. Optoelectronics
Research Centre, Tampere University of Technology, P.O. Box 692, FIN-33101 Tampere, Finland
4. Kekulé-Institute
of Organic Chemistry and Biochemistry, University of Bonn, Gerhard-Domagk-Straße
1, D-53121 Bonn, Germany