1. Key Laboratory of Luminescence Analysis and Molecular Sensing Ministry of Education School of Chemistry and Chemical Engineering Southwest University Chongqing 400715 P. R. China
2. Institute of Respiratory Diseases Xinqiao Hospital Third Military Medical University 183 Xinqiao Street Chongqing 400037 P. R. China
3. Department of Chemical and Biomolecular Engineering National University of Singapore Singapore 117585 Singapore