1. Department of ChemistryStanford University Stanford CA 94305 USA
2. Department of Materials Science and EngineeringSouth University of Science and Technology of China Shenzhen 518055 China
3. State Key Laboratory of Precision SpectroscopySchool of Physics and Materials ScienceEast China Normal University Shanghai 200062 China
4. School of Chemistry and Molecular EngineeringEast China Normal University Shanghai 200062 China
5. Collaborative Innovation Center of Extreme OpticsShanxi University Taiyuan Shanxi 030006 P. R. China