1. MOE Key Laboratory of Spectrochemical Analysis and Instrumentation; Xiamen University; Xiamen 361005 China
2. State Key Laboratory of Physical Chemistry of Solid Surfaces; Xiamen University; Xiamen 361005 China
3. College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
4. Xiamen Institute of Rare-earth Materials; Chinese Academy of Sciences; Xiamen 361005 China
5. Department of Physics; Xiamen University; Xiamen 361005 China