1. School of Materials Science and Engineering Shanghai University Shanghai 200444 P. R. China
2. Material Analysis Group Oxford Instruments Technology (Shanghai) Co., Ltd Shanghai 200233 P. R. China
3. Materials Institute of Genome Shanghai University Shanghai 200444 P. R. China
4. Key Laboratory of Inorganic Functional Materials and Devices Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200052 P. R. China
5. Department of Electronics and Materials Science Department of Optoelectronics and Nanostructure Science Graduate School of Science and Technology, and Department of Engineering, Graduate School of Integrated Science and Technology Shizuoka University 3-5-1 Johoku Naka-ku Hamamatsu 432-8011 Japan