1. Beijing Center for Crystal R&DKey Lab of Functional Crystals and Laser Technology, of the Chinese Academy of SciencesTechnical Institute of Physics and ChemistryChinese Academy of Sciences Beijing 100190 P. R. China
2. University of the Chinese Academy of Sciences Beijing 100049 P. R. China
3. College of Chemistry and Molecular EngineeringPeking University Beijing 100871 P. R. China