1. School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China
2. School of Physics, Hefei University of Technology, Hefei, 230061, China
3. School of Mathematics and Physics, Anhui Jianzhu University, Hefei, 230601, China
4. Anhui Research Center of Generic Technology in New Display Industry, Hefei, 230601, China