1. MOE Key Laboratory for UV Light-Emitting Materials and Technology Northeast Normal University Changchun Jilin 130024 P. R. China
2. Department of Chemistry Northeast Normal University Changchun Jilin 130024 P. R. China
3. School of Chemistry and Chemical Engineering Henan Normal University Xinxiang Henan 453007 P. R. China
4. Qingdao University of Science and Technology Qingdao Shandong 260061 China