1. National Laboratory for Organic Opto-Electronic Materials, Department of Chemical and Biomolecular Engineering (BK-21 Plus), Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea.
2. Functional Thin Film Laboratory, Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea.
3. Combustion Laboratory, Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea.
4. KAIST Institute for NanoCentury, Daejeon, South Korea.