1. Electronical Information Materials and Devices Engineering Research Center of Ministry of Education, Guangxi Key Laboratory of Information Materials, and School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin541004, China
2. School of Optical and Electronic Information, Engineering Research Center for Functional Ceramics MOE, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan430074, China
3. Department of Mechanical, Manufacturing and Materials Engineering, University of Nottingham, University Park, NottinghamNG7 2RD, U.K.
4. Advanced Research Institute of Multidisciplinary Science and School of Materials Science and Engineering, Beijing Institute of Technology, Beijing100081, China
5. Guilin Electrical Equipment Scientific Research Institute, Guilin541004, P. R. China