1. Department
of Electronics and Key Laboratory of Photo-Electronic Thin Film Devices
and Technology of Tianjin, Nankai University, Tianjin 300350, China
2. School
of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China
3. Institute
of Material Physics, Key Laboratory of Display Materials and Photoelectric
Devices, Ministry of Education, Tianjin University of Technology, Tianjin 300384, China
4. School
of Science, Shandong Jianzhu University, Jinan 250101, China
5. Research Group of Quantum-Dot Materials & Devices, Institute of New-Energy Materials, Tianjin University, Tianjin 300350, China
6. School of
Physics, University of Sydney, Sydney, NSW 2006, Australia