1. Center for Optoelectronics and Photonics Paderborn; University of Paderborn; Paderborn Germany
2. Department of Chemistry, Faculty of Science; University of Paderborn; Paderborn Germany
3. Institute of Electrical Engineering, Faculty of Electrical Engineering, Computer Science and Mathematics; University of Paderborn; Paderborn Germany
4. Centre de Recherce Paul Pascal; Université de Bordeaux; Bordeaux France