1. Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education Department of Chemistry Tsinghua University Beijing 100084 P. R. China
2. Department of Chemistry and Biochemistry San Diego State University 5500 Campanile Drive San Diego CA 92182‐1030 USA
3. International Research Center for Soft Matter Beijing Key Laboratory of Energy Environmental Catalysis State Key Laboratory of Organic–Inorganic Composites Beijing University of Chemical Technology Beijing 100029 P. R. China
4. College of Chemical Engineering and Materials Science Zhejiang University of Technology Hangzhou 310014 P. R. China