1. Optoelectronics Group Cavendish Laboratory University of Cambridge JJ Thomson Avenue Cambridge CB3 0HE UK
2. Laboratory for Chemistry of Novel Materials University of Mons Mons 7000 Belgium
3. Institut für Angewandte Physik Universität Tübingen Auf der Morgenstelle 10 72076 Tübingen Germany
4. Catalan Institute of Nanoscience and Nanotechnology (ICN2) CSIC and BIST Campus UAB, Bellaterra Barcelona 08193 Spain
5. Emergent Molecular Function Research Group RIKEN Center for Emergent Matter Science (CEMS) Wako Saitama 351‐0198 Japan
6. School of Chemistry and Biochemistry & Center for Organic Photonics and Electronics (COPE) Georgia Institute of Technology Atlanta GA 30332‐0400 USA
7. Department of Chemistry and Biochemistry The University of Arizona Tucson AZ 85721‐0088 USA
8. Dipartimento di Fisica Università di Cagliari, Cittadella Universitaria Monserrato (Ca) 09042 Italy