1. Department of Chemistry University of California Riverside CA 92521 USA
2. Department of Mechanical Engineering University of Colorado Boulder CO 80309 USA
3. Department of Chemical & Environmental Engineering and Materials Science & Engineering Program University of California Riverside CA 92521 USA
4. Materials Science and Engineering Program University of Colorado Boulder CO 80309 USA
5. 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