1. Joint Institute for Advanced MaterialsDepartment of Materials Science and EngineeringUniversity of Tennessee Knoxville TN 37996 USA
2. Department of ChemistryNational Taiwan Universityand Institute of Atomic and Molecular Science Academia Sinica Taipei 10617 Taiwan
3. Department of Electronic EngineeringMing Chi University of Technology New Taipei City 24301 Taiwan
4. Organic Electronics Research CenterMing Chi University of Technology New Taipei City 24301 Taiwan
5. Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology Wuhan 430074 China