1. Department of Polymer Science and Engineering, Department of Organic Device Engineering, Graduate School of Science and Engineering; Yamagata University; 4-3-16, Jonan, Yonezawa 992-8510 Japan
2. Denka Company Limited; 2209 Oaza Omi Itoigawa Niigata 949-0303 Japan
3. Department of Organic Materials Science, Graduate School of Organic Materials Science; Yamagata University; 4-3-16, Jonan, Yonezawa 992-8510 Japan