1. College of Optical and Electronic Technology, China Jiliang University, Hangzhou, Zhejiang 310018, China
2. School of Materials Science and Engineering, Liaocheng University, Liaocheng, Shandong 252000, China
3. Department of Physics and Interdisciplinary Program of Biomedical, Mechanical and Electrical Engineering, Pukyong National University, Busan 608-737, Republic of Korea
4. Yunnan Olightek Opto-electronic Technology Co., Ltd., Kunming 650223, China