1. Stratingh Institute for Chemistry University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
2. SCNU-UG International Joint Laboratory of Molecular Science and Displays National Center for International Research on Green Optoelectronics South China Normal University Guangzhou 510006 China
3. Department of Chemistry Graduate School of Science Tohoku University 6-3 Aramaki-Aza-Aoba Aobaku Sendai 980-8578 Japan
4. Molecular Materials and Nanosystems Eindhoven University of Technology 5600 MB Eindhoven The Netherlands