1. Molecular Imaging and Photonics Department of Chemistry KU Leuven Celestijnenlaan 200F Leuven 3001 Belgium
2. Department of Chemistry and iNANO Aarhus University Langelandsgade 140 Aarhus C 8000 Denmark
3. Departamento de Química Física, Facultad de Farmacia de Albacete UCLM Albacete 02071 Spain
4. Max Planck Institute for Polymer Research Ackermannweg 10 Mainz 55128 Germany
5. Max Planck Institute for Chemical Physics of Solids Nöthnitzer Str. 40 Dresden 01187 Germany
6. cMACS Department of Microbial and Molecular Systems KU Leuven Celestijnenlaan 200F Leuven 3001 Belgium
7. Quantum Solid‐State Physics (QSP) Department of Physics and Astronomy KU Leuven Celestijnenlaan 200D Leuven 3001 Belgium
8. High Field Magnet Laboratory and Institute for Molecules and Materials Radboud University Toernooiveld 7 Nijmegen 6525 ED Netherlands