| Affiliation: | 1. School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore;2. School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, PR China;3. Department of Physics and Astronomy, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599‐3255, USA;4. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China |
