1. State Key Laboratory of Silicon Materials, MOE Key Laboratory of Macromolecular, Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China
2. Department of Physics, Chinese University of Hong Kong, New Territories, 999077 Hong Kong, P. R. China
3. Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China
4. Microquanta Semiconductor, Hangzhou 311121, P. R. China
5. State Key Laboratory of Luminescent Materials and Devices, School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, P. R. China
6. Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, 999077, P. R. China