1. Yunnan Joint International Laboratory of Optoelectronic Materials and Devices, Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 650093, Yunnan, China
2. Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Key Laboratory of Photosensitive Materials & Devices of Liaoning Province, College of Physics and Materials Engineering, Dalian Minzu University, 18 Liaohe West Road, Dalian 116600, P. R. China