1. Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New City Fuzhou 350207 P. R. China
2. Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of Chemistry School of Science Tianjin University & Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072 P. R. China
3. Department of Chemistry National University of Singapore Singapore 117543 Singapore
4. Institute of Optoelectronic Display National & Local United Engineering Lab of Flat Panel Display Technology Fuzhou University Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350002 P. R. China
5. School of Materials Science and Engineering Xiamen University of Technology Xiamen 361024 P.R. China