1. School of Chemical Science University of Chinese Academy of Sciences Beijing 100049 China
2. Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China
3. Key Laboratory of Solid State Optoelectronic Devices of Zhejiang Province College of Physics and Electronic Information Engineering Zhejiang Normal University Jinhua Zhejiang 321004 China
4. Department of Physics The Chinese University of Hong Kong Hong Kong New Territories 999077 China
5. Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor‐optoelectronics Materials and Devices College of Chemistry, Chemical Engineering and Materials Science Soochow University Suzhou Jiangsu 215123 China