1. Department of Materials Science and Engineering; South University of Science and Technology of China; Shenzhen 518055 China
2. Research Center for Advanced Materials and Biotechnology; Research Institute of Tsinghua University in Shenzhen; Shenzhen 518057 China
3. Department of Chemistry; Stanford University; Stanford CA 94305 USA
4. State Key Laboratory of Precision Spectroscopy; East China Normal University; Shanghai 200062 China
5. Department of Physics; School of Sciences and Tianjin Collaborative Innovation Center of Chemical Science and Engineering; Tianjin University; Tianjin 300350 China