1. Center for Supramolecular
Optoelectronic Materials, Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of Korea
2. Samsung Display, 1 Samsung-ro, Giheung-Gu, Yongin 17113, Republic of Korea
3. Department of Electrical and Computer Engineering, Inter-University
Semiconductor Research Center (ISRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea