1. Institute
for Advanced Materials andGuangdong Provincial Laboratory of Quantum
Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China
2. State
Key Laboratory of Optoelectronic Materials and Technologies, School
of Microelectronics, Sun Yat-Sen University, Guangzhou 510274, China
3. Institute
of Electronic Paper Displays, South China Academy of Optoelectronics, South China Normal University, Guangzhou 510006, China
4. Laboratory
of Solid State Microstructures and Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China