1. National & Local Joint Engineering Research Center of Semiconductor Display and Optical Communication Devices, South China University of Technology, Guangzhou 510641, China
2. Guangdong Provincial Key Laboratory of Semiconductor Micro Display, Foshan Nationstar Optoelectronics Company Ltd., Foshan 528000, China
3. School of Engineering, RMIT University Melbourne 3000, Victoria, Australia
4. Department of Photonics and Institute of Electro-Optical Engineering College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan, China