1. School
of Chemistry, University of Edinburgh, King’s Buildings, Edinburgh, EH9 3FJ United Kingdom
2. Wuhan
National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei Province, People’s Republic of China 430074
3. Laboratory
of Photonics and Interfaces, Swiss Federal Institute of Technology (EPFL), Station 6, Lausanne, Switzerland
4. Adolphe Merkle Institute, Fribourg, Switzerland