1. School of Chemical Engineering and State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu 610065 P. R. China
2. School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology No. 122 Luoshi Road Wuhan 430070 P. R. China
3. Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
4. Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 P. R. China
5. National Synchrotron Light Source II Brookhaven National Lab Suffolk Upton NY 11973 USA