1. Institute of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, China
2. Yunnan Key Laboratory of Optoelectronic Information Technology, Kunming 650500, China
3. Key Laboratory of Advanced Technique & Preparation for Renewable Energy Materials, Ministry of Education, Yunnan Normal University, Kunming 650500, China
4. School of Accounting and Business Administration, Yunnan Minzu University, Kunming 650500, China