1. College of Materials and Chemistry China Jiliang University (CJLU) Hangzhou 310018 P. R. China
2. College of Physics and Optoelectronic Engineering Shenzhen University (SZU) Shenzhen 518060 P. R. China
3. Institute of Optoelectronic Materials and Devices China Jiliang University (CJLU) Hangzhou 310018 P. R. China
4. Department of Applied Physics The Hong Kong Polytechnic University (PolyU) Hong Kong P. R. China