1. Department of Chemistry; National University of Singapore; 117543 Singapore Singapore
2. Laboratory of Bioimaging Probe Development; Singapore Bioimaging Consortium; 138667 Singapore Singapore
3. Spectroscopy Laboratory for Functional π-Electronic Systems and Department of Chemistry; Yonsei University; Seoul 120-749 Korea
4. Graduate School of Materials Science; Nara Institute of Science and Technology; 8916-5 Takayama-cho Ikoma 630-0192 Japan
5. Education Center for Global Leaders in Molecular Systems for Devices; Kyushu University; 744 Motooka Nishi-ku Fukuoka 819-0395 Japan
6. Institute of Materials Research and Engineering, A*STAR; 2 Fusionopolis Way, Innovis, #08-03 117602 Singapore Singapore