1. Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials; Ministry-of-Education Key Laboratory of Green Preparation and Application for Functional Materials; Faculty of Materials Science and Engineering; Hubei University; Wuhan 430062 China
2. Anhui Key Laboratory of Nanomaterials and Technology and Key Laboratory of Materials Physics; Institute of Solid State Physics; Chinese Academy of Sciences; Hefei 230031 China
3. Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education; Wuhan University; Wuhan 430072 China