1. State Key Laboratory of Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) & Institute of Flexible Electronics (Future Technology) Nanjing University of Posts and Telecommunications 9 Wenyuan Road Nanjing 210023 P. R. China
2. Department of Chemistry City University of Hong Kong Tat Chee Avenue Hong Kong P. R. China
3. College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology) Jiangsu Province Engineering Research Center for Fabrication and Application of Special Optical Fiber Materials and Devices Nanjing University of Posts and Telecommunications 9 Wenyuan Road Nanjing 210023 P. R. China