1. School of Polymer Science and Engineering, Center for Optoelectronic Materials and Devices, The University of Southern Mississippi, Hattiesburg, Mississippi 39406, United States
2. Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan
3. Department of Chemistry and Biochemistry, Advanced Materials Centre of Research, University of Windsor, Windsor, Ontario N9B3P4, Canada
4. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States