From Event: SPIE Organic Photonics + Electronics, 2016
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.
Takuya Hosokai, Hiroyuki Matsuzaki, Akihiro Furube, Katsumi Tokumaru, Tetsuo Tsutsui, Hajime Nakanotani, Masayuki Yahiro, and Chihaya Adachi, "Role of intermediate state in the excited state dynamics of highly efficient TADF molecules," Proc. SPIE 9941, Organic Light Emitting Materials and Devices XX, 994107 (Presented at SPIE Organic Photonics + Electronics: August 28, 2016; Published: 23 September 2016); https://doi.org/10.1117/12.2236248.
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