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Proceedings Paper

Role of intermediate state in the excited state dynamics of highly efficient TADF molecules
Author(s): Takuya Hosokai; Hiroyuki Matsuzaki; Akihiro Furube; Katsumi Tokumaru; Tetsuo Tsutsui; Hajime Nakanotani; Masayuki Yahiro; Chihaya Adachi
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Paper Abstract

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.

Paper Details

Date Published: 23 September 2016
PDF: 6 pages
Proc. SPIE 9941, Organic Light Emitting Materials and Devices XX, 994107 (23 September 2016); doi: 10.1117/12.2236248
Show Author Affiliations
Takuya Hosokai, National Institute of Advanced Industrial Science and Technology (Japan)
CEREBA (Japan)
Hiroyuki Matsuzaki, National Institute of Advanced Industrial Science and Technology (Japan)
CEREBA (Japan)
Akihiro Furube, National Institute of Advanced Industrial Science and Technology (Japan)
CEREBA (Japan)
Katsumi Tokumaru, CEREBA (Japan)
Tetsuo Tsutsui, CEREBA (Japan)
Hajime Nakanotani, Kyushu Univ. (Japan)
Masayuki Yahiro, Institute of Systems, Information Technologies and Nanotechnologies (ISIT) (Japan)
Chihaya Adachi, Kyusyu Univ. (Japan)


Published in SPIE Proceedings Vol. 9941:
Organic Light Emitting Materials and Devices XX
Franky So; Chihaya Adachi; Jang-Joo Kim, Editor(s)

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