1. Organic
and Optoelectronic Materials Laboratory, Department of Advanced Organic
Materials and Textile System Engineering, Chungnam National University, Daejeon 305-764, Korea
2. Dongjin Semichem Co., Electronic Materials
Business Division, Jageundollae-gil
35, Yanggam-myeon, Hwaseong-si, Gyeonggi-do 445-935, Korea
3. Graduate School of Analytical Science and Technology, Chungnam National University, Daejeon 305-764, Korea