1. Central Research Laboratory Hamamatsu Photonics K.K. 5000 Hirakuchi, Hamakita‐ku Hamamatsu Shizuoka 434‐8601 Japan
2. Center for Organic Photonics and Electronics Research (OPERA) and Department of Applied Chemistry Kyushu University 744 Motooka Nishi Fukuoka 819‐0395 Japan
3. International Institute for Carbon Neutral Energy Research (WPI‐I2CNER) Kyushu University 744 Motooka, Nishi 819‐0395 Fukuoka Japan