1. Department of Chemical and Biomolecular and EngineeringNational University of Singapore 4 Engineering Drive 4 Singapore 117585 Singapore
2. State Key Laboratory on Integrated OptoelectronicsCollege of Electronic Science and EngineeringJilin University 2699 Qianjin Street Changchun 130012 P. R. China
3. College of Chemistry and Molecular EngineeringZhengzhou University 100 Science Road Zhengzhou 450001 P. R. China
4. Joint School of NationalUniversity of Singapore and Tianjin UniversityInternational Campus of Tianjin University Binhai New City Fuzhou 350207 P. R. China