1. Department of Chemistry; National University of Singapore; 3 Science Drive 3 117543 Singapore
2. SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology; Shenzhen University; Shenzhen 518060 China
3. Department of Physics; National University of Singapore; 2 Science Drive 3 117542 Singapore
4. Institute for Advanced Study and Department of Physics; Nanchang University; 999 Xue Fu Da Dao Nanchang 330031 China
5. State Key Laboratory of Luminescence and Applications; Changchun Institute of Optics; Fine Mechanics and Physics; Chinese Academy of Sciences; No. 3888 Dongnanhu Road Changchun 130033 China
6. National University of Singapore (Suzhou) Research Institute; 377 Lin Quan Street, Suzhou Industrial Park Jiang Su 215123 China