1. Xi’an Key Laboratory of Liquid Crystal and Organic Photovoltaic Materials, State Key Laboratory of Fluorine and Nitrogen Chemicals, Xi’an Modern Chemistry Research Institute, Xi’an, Shaanxi 710065, P. R. China
2. Key Laboratory of Physical Electronics and Devices of the Ministry of Education and Shaanxi Key Lab of Photonic Technique for Information, School of Electronic Science and Engineering, Faculty of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, P. R. China
3. School of Chemical Engineering, Xi’an University, No. 168 of South Taibai Road, Xi’an 710065, China
4. Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi 710054, P. R. China