1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science & Engineering, Jilin University 1 , Changchun, Jilin 130012, China
2. College of Science, Changchun University of Science and Technology 2 , Changchun, Jilin 130022, China
3. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University 3 , Changchun, Jilin 136000, China