1. Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Fuzhou 350207, China
2. School of Materials Science and Engineering, and Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin 300072, China
3. Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543 Singapore
4. Institute of Optoelectronic Display, National & Local United Engineering Lab of Flat Panel Display Technology, Fuzhou University, Fuzhou 350002, China
5. School of Science, Anhui Agricultural University, Hefei 230036, China