TY - JOUR
T1 - Revealing the Excited-state Dynamics of Thermally Activated Delayed Fluorescence Molecules by using Transient Absorption Npectroscopy
AU - Hosokai, Takuya
AU - Matsuzaki, Hiroyuki
AU - Furube, Akihiro
AU - Tokumaru, Katsumi
AU - Tsutsui, Tetsuo
AU - Nakanotani, Hajime
AU - Yahiro, Masayuki
AU - Adachi, Chihaya
N1 - Funding Information:
This work was supported in part by the ‘Development of Fundamental Evaluation Technology for Next-generation Chemical Materials’ program commissioned by the New Energy and Industrial Technology Development Organization (NEDO). 8. References [1] H. Uoyama, et al., Highly Efficient Organic Light-Emitting Diodes from Delayed Fluorescence. Nature, 492, 234 (2012).
Publisher Copyright:
© 2016 SID.
PY - 2016
Y1 - 2016
N2 - Excited state dynamics is a central issue in discussing the origin of the high efficiency of thermally activated delayed fluorescence (TADF) molecules. Here we will present experimentally a complexity of the excited state dynamics of the extremely high efficient TADF molecules, 4CzIPN. By means of pump-probe transient absorption spectroscopy, we will show the sign of intramolecular charge delocalization formed in the excited state. This specific excited state originates from the intramolecular charge resonance within carbazole moieties, which occurs through the dimerization of the moieties. On the other hand, the counter molecules of 4CzIPN, i.e. 2CzPN, forms only a localized excited state. The role of charge delocalized state for TADF efficiency will be discussed.
AB - Excited state dynamics is a central issue in discussing the origin of the high efficiency of thermally activated delayed fluorescence (TADF) molecules. Here we will present experimentally a complexity of the excited state dynamics of the extremely high efficient TADF molecules, 4CzIPN. By means of pump-probe transient absorption spectroscopy, we will show the sign of intramolecular charge delocalization formed in the excited state. This specific excited state originates from the intramolecular charge resonance within carbazole moieties, which occurs through the dimerization of the moieties. On the other hand, the counter molecules of 4CzIPN, i.e. 2CzPN, forms only a localized excited state. The role of charge delocalized state for TADF efficiency will be discussed.
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U2 - 10.1002/SDTP.10790
DO - 10.1002/SDTP.10790
M3 - Conference article
AN - SCOPUS:85006851068
VL - 47
SP - 786
EP - 789
JO - Digest of Technical Papers - SID International Symposium
JF - Digest of Technical Papers - SID International Symposium
SN - 0097-966X
IS - 1
T2 - 54th Annual SID Symposium, Seminar, and Exhibition 2016, Display Week 2016
Y2 - 22 May 2016 through 27 May 2016
ER -