1. School of Chemical and Environmental EngineeringShanghai Institute of Technology 100 Haiquan Road Shanghai 201418 P.R. China
2. Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education Department of ChemistryTsinghua University Beijing 100084 P.R. China
3. State Key Laboratory of Natural and Biomimetic DrugsPeking University Beijing 100191 P. R. China