1. School of Chemistry and Biochemistry, Center for Organic Photonics and Electronics, Georgia Tech Polymer Network, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
2. Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, United States
3. Department of Chemistry and Physics, Fayetteville State University, Fayetteville, North Carolina 28301, United States
4. Institute of Physical Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstr. 28/30, D-48149 Münster, Germany
5. SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
6. Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States