1. Research Center for Crystal Materials, CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences (CAS), 40-1 South Beijing Road, Urumqi 830011, China
2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3. College of Materials Science and Engineering, Hunan University, Changsha 410004, China