TY - JOUR
T1 - Novel Series of Mononuclear Aluminum Complexes for High-Performance Solution-Processed Organic Light-Emitting Devices
AU - Nakao, Kohei
AU - Sasabe, Hisahiro
AU - Shibuya, Yusuke
AU - Matsunaga, Amane
AU - Katagiri, Hiroshi
AU - Kido, Junji
N1 - Funding Information:
We greatly acknowledge partial financial support from the Center of Innovation (COI) Program of the Japan Science and Technology Agency, JST. H.S. acknowledges partial financial support by JSPS KAKENHI (17H03131, 20H02807) from JSPS. K.N. acknowledges partial financial support by 19J12776 from JSPS.
Publisher Copyright:
© 2020 Wiley-VCH GmbH
PY - 2021/3/8
Y1 - 2021/3/8
N2 - Light metal complexes, such as lithium (Li), sodium (Na), magnesium (Mg), and aluminum (Al) complexes, are attractive candidates for the fabrication of thermally activated delayed fluorescent (TADF) materials. Nevertheless, mononuclear Al complexes with delayed fluorescence have not been developed so far. In this study, we successfully developed a novel series of highly luminescent Al complexes with two phenylacridine-modified asymmetric acetylacetonate-type ligands. These complexes exhibit high photoluminescence quantum yields (PLQYs) of up to 79 % in the solid state with a short delayed fluorescence lifetime of approximately 4 μs. Solution-processed organic light-emitting devices (OLEDs) using these Al complexes exhibit excellent performance with an external quantum efficiency of 17.5 % at 100 cd m−2. This is the best performance in light metal-based TADF OLEDs reported so far. The results are expected to guide the advancement of the next-generation solid-state lighting technology.
AB - Light metal complexes, such as lithium (Li), sodium (Na), magnesium (Mg), and aluminum (Al) complexes, are attractive candidates for the fabrication of thermally activated delayed fluorescent (TADF) materials. Nevertheless, mononuclear Al complexes with delayed fluorescence have not been developed so far. In this study, we successfully developed a novel series of highly luminescent Al complexes with two phenylacridine-modified asymmetric acetylacetonate-type ligands. These complexes exhibit high photoluminescence quantum yields (PLQYs) of up to 79 % in the solid state with a short delayed fluorescence lifetime of approximately 4 μs. Solution-processed organic light-emitting devices (OLEDs) using these Al complexes exhibit excellent performance with an external quantum efficiency of 17.5 % at 100 cd m−2. This is the best performance in light metal-based TADF OLEDs reported so far. The results are expected to guide the advancement of the next-generation solid-state lighting technology.
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U2 - 10.1002/anie.202014941
DO - 10.1002/anie.202014941
M3 - Article
C2 - 33319430
AN - SCOPUS:85099742164
SN - 1433-7851
VL - 60
SP - 6036
EP - 6041
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 11
ER -