1. Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Fuzhou 350207, China
2. Department of Chemistry, National University of Singapore, Singapore 117543, Singapore
3. Applied Mechanics Laboratory, Department of Engineering Mechanics and Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China
4. Institute of Molecular Plus, Tianjin University, Tianjin 300072, China
5. Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China
6. National and Local United Engineering Lab of Flat Panel Display Technology, Institute of Optoelectronic Display, Fuzhou University, Fuzhou 350108, China