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