1. Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, P. R. China
2. College of Physics and Electronic Engineering, Taishan University, Taian 271021, P. R. China
3. Institutde Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), Université de Strasbourg CNRS, UMR 7515, 25 rue Becquerel, 67087 Strasbourg, Cedex 02, France
4. College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, P. R. China
5. State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China