1. Department of ChemistryHumboldt-Universität zu Berlin Brook-Taylor-Str. 2 12489 Berlin Germany
2. Institute of Organic Chemistry and Biochemistry of the CAS Flemingovo nám. 2 166 10 Prague Czech Republic
3. Division BiophotonicsFederal Institute for Materials Research and Testing (BAM) Richard- Willstätter-Straße 11 12489 Berlin Germany
4. Institute of Chemistry and BiochemistryFree University of Berlin Takustrasse 3 14195 Berlin Germany
5. Bundesanstalt für Materialforschung und -prüfung (BAM) Unter den Eichen 87 12205 Berlin Germany
6. College of Polymer Science and EngineeringState Key Laboratory of Polymer Materials EngineeringSichuan University Chengdu 610065 P. R. China