1. State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and Devices School of Materials Science and Engineering South China University of Technology 381 Wushan Road Guangzhou 510640 P. R. China
2. Institute of Preventive Medicine School of Public Health Dali University Dali 671000 P. R. China
3. Innovation Center of Printed Photovoltaics South China Institute of Collaborative Innovation Dongguan 523808 P. R. China
4. Department of Materials Science and Engineering City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong
5. School of Energy and Environment City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong