1. Department of Chemistry and Institute for Coatings and Surface ChemistryNiederrhein University of Applied Sciences Adlerstr. 1 D-47798 Krefeld Germany
2. Laboratory of Macromolecular Photochemistry and EngineeringUniversity of Haute-Alsace 3b rue Alfred Werner 68093 Mulhouse France
3. PicoQuant GmbH Rudower Chaussee 29 D-12489 Berlin Germany