1. Department of Materials Science and Engineering; University of Washington; Seattle WA 98195 USA
2. Department of Chemical Engineering; National Cheng Kung University; Tainan 70101 Taiwan
3. Department of Chemical Engineering; University of Washington; Seattle WA 98195 USA
4. State Key Laboratory of Organic Solids; Beijing National Laboratory for Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P. R. China
5. Advanced Optoelectronic Technology Center; National Cheng Kung University; Tainan 70101 Taiwan