1. School of Physics Science and Technology, Xinjiang University, Urumqi 830046, China
2. Key Laboratory for Micro/Nano-Optoelectronic Devices of Ministry of Education & International Science and Technology Innovation Cooperation Base for Advanced Display Technologies of Hunan Province, School of Physics and Electronics, Hunan University, Changsha 410082, China
3. School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, China