1. Department of Organic Materials ScienceYamagata University 4‐3‐16 Jonan Yonezawa Yamagata 992–8510 Japan
2. Frontier Center for Organic Materials (FROM) Yamagata University 4‐3‐16 Jonan Yonezawa Yamagata 992–8510 Japan
3. Research Center for Organic Electronics (ROEL) Yamagata University 4‐3‐16 Jonan Yonezawa Yamagata 992–8510 Japan
4. Japan Synchrotron Radiation Research Institute (JASRI) SPring‐8, 1‐1‐1 Kouto, Sayo Hyogo 679–5198 Japan