1. Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, School of Electronic Science and Engineering, and the Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing, P. R. China
2. School of Integrated Circuits, Nanjing University, Suzhou, P. R. China
3. Tan Kah Kee Innovation Laboratory, Institute of Future Display Technology, Xiamen University, Xiamen, P. R. China