| 1. |
Ryo Nagata, Kenichi Goushi, Hajime Nakanotani, Chihaya Adachi, Organic Electronics Materials and Devices: Organic Light-Emitting Diodes (OLEDs): Materials, Photophysics, and Device Physics, Springer Tokyo, https://doi.org/10.1007/978-4-431-56936-7, 2024.01. |
| 2. |
Hajime Nakanotani, Chihaya Adachi, Light-Emitting Organic Crystal Field-Effect Transistors for Future Organic Injection Lasers, Wiley-VCH, 10.1002/9783527655946.ch18, 603-621, 2013.01. |
| 3. |
Takahiro Higuchi, Hajime Nakanotani, Chihaya Adachi, High-efficiency organic light-emitting diodes with blue fluorescent emitter, Optical Society of America (OSA), 2014.11, We achieved highly efficient blue fluorescent emitter based OLEDs by utilizing a thermally activated delayed fluorescence (TADF) material as a triplet energy harvesting source and a conventional blue fluorescence molecule as the end emitter.. |
| 4. |
Takuya Hosokai, Hiroyuki Matsuzaki, Akihiro Furube, Katsumi Tokumaru, Tetsuo Tsutsui, Hajime Nakanotani, Masayuki Yahiro, Chihaya Adachi, Role of intermediate state in the excited state dynamics of highly efficient TADF molecules, SPIE, 10.1117/12.2236248, 9941, 2016.01, We hereby report the results of our direct investigation into the excited-state dynamics of thermally activated delayed fluorescence (TADF) molecules in solution using pump-probe transient absorption spectroscopy (TAS). We found that the charge-transfer (CT) state commonly stated for TADF molecules encompasses two forms: localized and delocalized CT states. A highly efficient TADF molecule, 4CzIPN [Uoyama et al., Nature, 492, 234-238 (2012)], showed both the localized and delocalized CT states, while an inefficient TADF molecule, 2CzPN, exhibited only a localized CT state. By analyzing the time profile of triplet species observed in TAS, we propose that the reverse intersystem crossing (RISC) of 4CzIPN occurs via a mutual interaction in multiple energy levels of localized neutral and CT states, and delocalized CT states.. |
