1. LG Display R&D Center; 1007, Deogeun-ri 413-811 Wollong-myenon, Paju-si, Gyeonggi-do Korea
2. Department of Materials Engineering, School of Engineering, The University of Tokyo; 7-3-1 Hongo 113-8656 Bunkyo-ku, Tokyo Japan
3. IBM Research; 257 Fuller Road, Suite 3100 Albany New York NY 12203 USA