1. Center for Polymers and Organic Solids, University of California, Santa Barbara, United States
2. Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, P.R. China
3. Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St Andrews, U.K.
4. Centre for Organic Photonics and Electronics, The University of Queensland, Australia 4072