1. Research Center for Advanced Information Materials (CAIM), Huangpu Research & Graduate School of Guangzhou University, Guangzhou, Guangdong510555, People’s Republic of China
2. Solid State Physics & Material Research Laboratory, School of Physics and Material Science, Guangzhou University, Guangzhou, Guangdong510006, People’s Republic of China
3. School of Physics, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat-sen University, Guangzhou, Guangdong510275, People’s Republic of China