1. Shenzhen Key Laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 P. R. China
2. Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information Huazhong University of Science and Technology Hubei 430074 P. R. China
3. CNRS, ISCR (Institut des Sciences Chimiques de Rennes) Université de Rennes UMR 6226 Rennes F-35000 France