* Corresponding authors

^a National University of Singapore (Suzhou) Research Institute, Suzhou, China
E-mail: phycw@nus.edu.sg

^b Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore

^c Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore

^d School of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China

^e Department of Physics, Nanchang University, 999 Xue Fu Da Dao, Nanchang 330031, China

^f Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211800, P. R. China

^g Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China

^h Key Laboratory of Mesoscopic Chemistry of MOE and Jiangsu Provincial Lab for Nanotechnology, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
E-mail: zhenghu@nju.edu.cn

ⁱ SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Shenzhen University, Shenzhen 518060, China