1. Beijing Advanced Innovation Center for Materials Genome Engineering & Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 P. R. China
2. Department of Chemistry and Chemical Engineering School of Chemistry and Biological Engineering University of Science and Technology Beijing 100083 P. R. China
3. School of Science Xijing University Xi'an Shaanxi 710123 P. R. China
4. Chemical Physics Interdisciplinary Program in Liquid Crystal Institute Kent State University Kent OH 44242 USA