1. ESAT/Light and Lighting Laboratory, KU Leuven, Gebroeders Desmetstraat 1, Ghent 9000, Belgium
2. Novopolymers NV, Rijksweg 81, Puurs 2870, Belgium
3. ESAT/E&A, KU Leuven, Gebroeders Desmetstraat 1, Ghent 9000, Belgium
4. Department of Chemistry, KU Leuven, Celestijnenlaan 200 F, Bus 2404, Leuven 3001, Belgium
5. ESAT/ELECTA, KU Leuven, Kasteelpark Arenberg 10, Bus 2445, Leuven 3001, Belgium