1. Department of Polymer Science Engineering; Inha University; Incheon 402-751 South Korea
2. Department of Electrical and Computer Engineering; Inter-University Semiconductor Research Center, Seoul National University; Seoul 151-744 South Korea
3. Department of Chemistry; Chemistry Institute for Functional Materials, Pusan National University; Busan 609-735 South Korea
4. Department of Materials Science and Engineering; University of Seoul; Seoul 130-743 South Korea
5. LG Display Co., Ltd., Paju-Si; Gyeonggi-Do 413-811 South Korea