1. State Key Laboratory of Rare Earth Resource UtilizationChangchun Institute of Applied ChemistryChinese Academy of Sciences Changchun 130022 China
2. University of Science and Technology of China Hefei 230026 China
3. Key Laboratory of Polymer EcomaterialsChangchun Institute of Applied ChemistryChinese Academy of Sciences Changchun 130022 China
4. University of Chinese Academy of Sciences Beijing 100049 P. R. China