TY - JOUR
T1 - Donor–σ–Acceptor Motifs
T2 - Thermally Activated Delayed Fluorescence Emitters with Dual Upconversion
AU - Geng, Yan
AU - D'Aleo, Anthony
AU - Inada, Ko
AU - Cui, Lin Song
AU - Kim, Jong Uk
AU - Nakanotani, Hajime
AU - Adachi, Chihaya
N1 - Funding Information:
This research was supported by JST ERATO Grant Number JPMJER1305, Japan.
Publisher Copyright:
© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2017/12/22
Y1 - 2017/12/22
N2 - A family of organic emitters with a donor–σ–acceptor (D-σ-A) motif is presented. Owing to the weakly coupled D-σ-A intramolecular charge-transfer state, a transition from the localized excited triplet state (3LE) and charge-transfer triplet state (3CT) to the charge-transfer singlet state (1CT) occurred with a small activation energy and high photoluminescence quantum efficiency. Two thermally activated delayed fluorescence (TADF) components were identified, one of which has a very short lifetime of 200–400 ns and the other a longer TADF lifetime of the order of microseconds. In particular, the two D-σ-A materials presented strong blue emission with TADF properties in toluene. These results will shed light on the molecular design of new TADF emitters with short delayed lifetimes.
AB - A family of organic emitters with a donor–σ–acceptor (D-σ-A) motif is presented. Owing to the weakly coupled D-σ-A intramolecular charge-transfer state, a transition from the localized excited triplet state (3LE) and charge-transfer triplet state (3CT) to the charge-transfer singlet state (1CT) occurred with a small activation energy and high photoluminescence quantum efficiency. Two thermally activated delayed fluorescence (TADF) components were identified, one of which has a very short lifetime of 200–400 ns and the other a longer TADF lifetime of the order of microseconds. In particular, the two D-σ-A materials presented strong blue emission with TADF properties in toluene. These results will shed light on the molecular design of new TADF emitters with short delayed lifetimes.
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U2 - 10.1002/anie.201708876
DO - 10.1002/anie.201708876
M3 - Article
C2 - 29105906
AN - SCOPUS:85034862973
SN - 1433-7851
VL - 56
SP - 16536
EP - 16540
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 52
ER -