1. Institute of Optoelectronic Display, National & Local United Engineering Lab of Flat Panel Display Technology, Fuzhou University, Fuzhou 350002, China
2. College
of Information Science and Engineering, Fujian University of Technology, Fuzhou 350108, China
3. Key
Laboratory of Artificial Micro- and Nano-Structures, Ministry of Education,
Department of Physics, Wuhan University, Wuhan 430072, China