1. Beijing National Laboratory for Molecular Sciences CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
2. Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of Chemistry Tsinghua University Beijing 100084 P. R. China
3. JiHua Laboratory Foshan 528200 Guangdong Province P. R. China
4. School of Chemical Sciences University of Chinese Academy of Sciences Beijing 100049 P. R. China
5. Center for Flexible Electronics Technology Tsinghua University Beijing 100084 P. R. China