1. Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China
2. School of Chemical Science University of Chinese Academy of Sciences Beijing 100049 China
3. Department of Physics and Organic and Carbon Electronics Lab North Carolina State University Raleigh NC 27695 USA
4. College of Chemistry Beijing Normal University Beijing 100875 China
5. Laboratory of Advanced Optoelectronic Materials College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou Jiangsu 215123 China