1. College of Materials Science and Opto-electronic Technology, Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
2. Songshan Lake Materials Laboratory, Dongguan 523808, China
3. College of Physics and Telecommunication Engineering, Zhoukou Normal University, Zhoukou 466001, China
4. Spallation Neutron Source Science Center, Dongguan 523803, Guangdong, China