1. Department of Engineering Physics, École Polytechnique de Montréal, Montréal H3C 3A7, QC,Canada
2. Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United States
3. Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan
4. International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan
5. Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606−8502, Japan