Electrogenerated chemiluminescence of donor-acceptor molecules with thermally activated delayed fluorescence.
The electrochemistry and electrogenerated chemiluminescence (ECL) of four kinds of electron donor-acceptor molecules exhibiting thermally activated delayed fluorescence (TADF) is presented. TADF molecules can harvest light energy from the lowest triplet state by spin up-conversion to the lowest singlet state because of small energy gap between these states. Intense green to red ECL is emitted from the TADF molecules by applying a square-wave voltage. Remarkably, it is shown that the efficiency of ECL from one of the TADF molecule could reach about 50%, which is comparable to its photoluminescence quantum yield.
Department of Applied Chemistry, Graduate School of Engineering, Kyushu University (Japan). Ishimatsu@cstf.kyushu-u.ac.jp.
Ryoichi
R
Ishimatsu
Shigeyuki
S
Matsunami
Takashi
T
Kasahara
Jun
J
Mizuno
Tomohiko
T
Edura
Chihaya
C
Adachi
Koji
K
Nakano
Toshihiko
T
Imato
electrochemiluminescence; electrochemistry; kinetics; quantum yield; solvent effects