4 School of Materials Science and Engineering, Harbin Institute of Technology, 150001, Harbin, China.
5 Department of Chemistry, National University of Singapore, 117543, Singapore, Singapore.
6 GPL Photonics Lab, State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 130033, Changchun, China.
7 School of Electronics and Information Engineering, Sichuan University, 610064, Chengdu, Sichuan, China.
8 School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore, Singapore.
9 Departments of Electrical and Computer Engineering, Physics and Astronomy, and Materials Science and NanoEngineering, Rice University, Houston, TX, USA.
10 School of Materials Science and Engineering, Harbin Institute of Technology, 150001, Harbin, China. lxj0218@hit.edu.cn.
11 School of Material Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore. z.liu@ntu.edu.sg.