1. Graduate School of Natural Science and Technology Okayama University 3-1-1 Tsushimanaka, Kita-ku Okayama 700–8530 Japan
2. Department of Chemistry, Faculty of Science Ain Shams University 11566 Cairo Egypt
3. Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting and Department of Electrical & Electronic Engineering Southern University of Science and Technology Shenzhen 518055 P. R. China
4. Department of Physics Okayama University Okayama 700–8530 Japan
5. Shenzhen Planck Innovation Technology Co., Ltd No. 8, Liuhe Road, Longgang District Shenzhen 518100, Guangdong P. R. China