1. State Key Laboratory for Modification of Chemical Fiber and Polymer Materials National Manufacturing Innovation Center of Advanced Dyeing and Finishing Technology College of Chemistry, Chemical Engineering and Biotechnology Donghua University Shanghai 201620 P. R. China
2. State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai 200433 China
3. Laboratory of Organic Electronics Department of Science and Technology Linköping University 60174 Norrköping Sweden
4. Department of Physics and Astronomy Uppsala University Box 516 75120 Uppsala Sweden
5. Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore