1. Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz,
Germany
2. Optics and Spectroscopy
Department,
Faculty of Physics, Sofia University “St. Kliment Ochridski”, 5 James Bourchier, 1164 Sofia, Bulgaria
3. Materials Science Laboratory, Sony Deutschland GmbH, Hedelfingerstrasse 61, 70327
Stuttgart, Germany
4. Department
of Chemistry, Moscow State University,
Moscow 119899, Russia