1. School of Physics and Electronic-Electrical Engineering, Ningxia University, Yinchuan, Ningxia 750021, People’s Republic of China
2. School of Electrical and Information Engineering, North Minzu University, Yinchuan, Ningxia 750030, People’s Republic of China
3. School of Electrical & Electronic Engineering, Tianjin Key Laboratory of Film Electronic & Communication Devices, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
4. R&D Department, Longji Ningguang Instrument Company, Limited, Yinchuan, Ningxia 750021, People’s Republic of China