1. Key Laboratory of Design and Assembly of Functional NanostructuresFujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of Sciences Fuzhou 350002 P. R. China
2. Key Laboratory of Optoelectronic Materials Chemistry and PhysicsFujian Institute of Research on the Structure of MatterChinese Academy of Sciences Fuzhou 350002 P. R. China
3. University of Chinese Academy of Sciences Beijing 100049 P. R. China