1. State Key Laboratory of Polymer
Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R.
China
2. Graduate School of Chinese Academy of Sciences, Beijing 100049, P. R.
China
3. Key Laboratory of UV
Light Emitting
Materials and Technology under Ministry of Education, Northeast Normal University, Changchun 130024, P. R.
China