1. Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education, Chongqing University, Chongqing 400044, People’s Republic of China
2. College of Science, Chongqing University of Technology, Chongqing 400054, People’s Republic of China
3. College of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, People’s Republic of China
4. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, People’s Republic of China