1. Center for Organic Photonics
and Electronics Research (OPERA), Center for Future Chemistry, Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395,
Japan
2. Department of Organic
Device
Engineering, Graduate School of Science and Engineering, Yamagata University, 4-3-16 Johnan, Yonezawa, Yamagata 992-8510,
Japan