1. Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012, P. R. China
2. Key Laboratory for UV−Emitting Materials and Technology of Ministry of Education, Northeast Normal University, 5268 Renmin Street, Changchun 130024, China
3. Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
4. Department of Medical Bioscience, Faculty of Bioscience, Nagahama institute of Bio-Science and Technology, Nagahama, Shiga 5260829, Japan