1. Organic and Optoelectronic Materials Laboratory Department of Organic Materials and Textile System EngineeringChungnam National University Daejeon 34134 Republic of Korea
2. Department of Chemical EngineeringInha University Incheon 22212 Republic of Korea
3. Department of PhysicsGyeongsang National University Jinju 52828 Republic of Korea
4. Department of ChemistryKyonggi University Suwon 16227 Republic of Korea