1. Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province, National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Faculty of Chemical Engineering, Huaiyin Institute of Technology, Huaian, Jiangsu, P. R. China
2. Department of Chemistry, Faculty of Science and Engineering, University of Hull, Cottingham Road, Kingston Upon Hull, UK
3. Polar OLED, University of Hull, Cottingham Road, Kingston Upon Hull, UK