1. School of Materials Science and Engineering, Shanghai University, Shanghai, China
2. Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai, China
3. School of Green Energy & Semiconductor Eng., Hoseo University, Asan City, Chungnam, South Korea
4. National Engineering Lab of TFT-LCD Materials and Technologies, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai, China