1. College of Electronic and Information Engineering Shenzhen University Shenzhen 518060 P. R. China
2. State Key Laboratory of Advanced Displays and Optoelectronics Technologies The Hong Kong University of Science and Technology Hong Kong SAR 999077 P. R. China
3. Institute of Microscale Optoelectronics (IMO) Shenzhen University Shenzhen 518060 P. R. China
4. Institute for Advanced Study Shenzhen University Shenzhen 518060 P. R. China