1. College of Physics, Jilin Normal University, No. 1301 Haifeng Street, Tiexi District, Siping 136000, P. R. China
2. Department of Chemistry, Towson University, 8000 York Road, Towson, Maryland 21252, United States
3. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, No. 3888 Dongnanhu Road, Nanguan
District, Changchun 130033, P. R. China