1. Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry, and State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, 510275, Guangzhou, China
2. Department of Physics, Renmin University of China, Beijing, 100872, P. R. China
3. State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, Guangdong 510640, P. R. China
4. Key Laboratory of Low-Carbon Chemistry & Energy Conser-vation of Guangdong Province, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, P. R. China
5. College of Chemistry, South China Normal University, Guangzhou, 510006, P. R. China
6. Instrumental Analysis and Research Center, Sun Yat-Sen University, Guangzhou, 510275, P. R. China
7. Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
8. Center for Advancing Electronics Dresden (cfaed) and Faculty of Chemistry and Food Chemistry, Technical University of Dresden, 01069 Dresden, Germany
9. Central Facility of Electron Microscopy, Electron Microscopy Group of Materials Science, Universität Ulm, 89081 Ulm, Germany