1. School of Polymer Science and Engineering Center for Optoelectronic Materials and Devices The University of Southern Mississippi Hattiesburg MS 39406 USA
2. Department of Chemistry and Biochemistry University of Windsor Ontario N9B3P4 Canada
3. Department of Polymer Science and Engineering School of Chemistry and Chemical Engineering State Key Laboratory of Coordination Chemistry Nanjing University Nanjing 210093 China
4. Department of Chemical Engineering National Taiwan University of Science and Technology Taipei 106 Taiwan
5. The Molecular Foundry Lawrence Berkeley National Laboratory Berkeley CA 94720 USA