1. Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4 Singapore 117576 Singapore
2. Department of Chemistry; Institute for Advanced Study; State Key Laboratory of Molecular Neuroscience; Institute of Molecular Functional Materials; Division of Biomedical Engineering; The Hong Kong University of Science and Technology; Clear Water Bay Kowloon Hong Kong China
3. Department of Chemistry; 3 Science Drive 3; National University of Singapore; Singapore 117543 Singapore
4. SCUT-HKUST Joint Research Laboratory; Guangdong Innovative Research Team; State Key Laboratory of Luminescent Materials and Devices; South China University of Technology; Guangzhou 510640 China
5. Institute of Materials Research and Engineering; Agency for Science; Technology and Research (A*STAR); 3 Research Link Singapore 117602 Singapore