1. School
of Materials Science Engineering, Nanyang Technological University, 639798, Singapore
2. Beijing
National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, 100190 Beijing, P. R. China
3. School
of Electrical and Electronic Engineering, Nanyang Technological University, 639798, Singapore
4. Key
Laboratory of Theoretical and Computational Photochemistry, Ministry
of Education, College of Chemistry, Beijing Normal University, 100875 Beijing, China