1. School of Material Science and Engineering
2. Hebei University of Technology
3. Tianjin 300130
4. China
5. Department of Electronics and Key Laboratory of Photo-Electronic Thin Film Devices and Technology of Tianjin
6. Nankai University
7. Tianjin 300071
8. Institute of Material Physics
9. Key Laboratory of Display Materials and Photoelectric Devices
10. Ministry of Education
11. Tianjin University of Technology
12. Tianjin 300384