1. Institute for Materials Research (IMO-IMOMEC); Hasselt University; Wetenschapspark 1 B-3590 Diepenbeek Belgium
2. IMEC vzw - Division IMOMEC; Wetenschapspark 1 B-3590 Diepenbeek Belgium
3. Division Molecular Imaging and Photonics; KU Leuven; Department of Chemistry; Celestijnenlaan 200D; 3001 Heverlee Belgium