1. School of Microelectronics & Data Science, Anhui University of Technology, Maanshan 243000, China
2. School of Physics and Optoelectronics, South China University of Technology, Guangdong 510640, China
3. Analysis and Testing Central Facility, Anhui University of Technology, Maanshan 243000, China
4. Physics Experiment Teaching Center, School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China
5. Anhui Research Center of Generic Technology in New Display Industry, Hefei 230009, P. R. China