1. State Key Laboratory of Polymer Physics
and Chemistry, Changchun Institute of Applied Chemistry, University of Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
2. The Organic
Photonics and Electronics Group, Department of Physics, Umeå University, SE-901 87 Umeå, Sweden
3. Department of Chemistry, King Saud University, Riyadh, Kingdom of Saudi Arabia