1. School of Science, Chongqing University of Posts and Telecommunications, Chongqing, 400065, P. R. China
2. School of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, PR China
3. Department of Electronics and Information Convergence Engineering, Institute for Wearable Convergence Electronics, Kyung Hee University, Yongin-si, Gyeonggi-do, 17104, Republic of Korea