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DOI: 10.1039/C4CC09403D
device demonstrated ηext = 19.6% at J = 0.11 mA/cm2, while the
Mg-1 and Li-1 devices showed ηext = 16.5% at J = 0.06 mA/cm2 and
ηext = 12.9% at J = 0.05 mA/cm2, respectively (Fig. 6). The
calculated ηext, assuming ηout ≈ 20%, were estimated to be 15.2%
(Zn-1), 13.4% (Mg-1) and 13.7% (Li-1). The experimentally
obtained ηext showed slightly higher values of 19.6% (Zn-1) and
16.5% (Mg-1), suggesting the contribution of molecular orientation
(Table 2, Eq. S2).
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13 M. N. BerbaranꢀSantos and C. Baleizao. ChemPhysChem, 2010, 11
,
In summary, we synthesized new TADF materials based on
metal complexes having ILCT transition. The new metal complexes
showed good thermal stability for the fabrication of thin films by
vacuum vapor deposition. Furthermore, we realized the reduction of
ꢁEST and enhancement of kRISC by metallization. The OLEDs using
Zn-1 achieved very high ηext close to 20%.
3133
14 S. Igawa, M. Hashimoto, I. Kawata, M. Yashima, M. Hoshino and M.
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15 M. Osawa, I. Kawano, R. Ishii, S. Igawa, M. Hashimoto and M.
Hoshinoa, J. Mater. Chem. C, 2013, , 4375
1
1
This research is supported by the Japan Society for the
Promotion of Science (JSPS) through its “Funding Program for
WorldꢀLeading Innovative R&D on Science and Technology
(FIRST Program).”
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Notes and references
Center for Organic Photonics and Electronics Research (OPERA),
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Kyushu University, 744 Motooka, Nishi, Fukuoka 819ꢀ0395, Japan.
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Japan
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International Institute for Carbon Neutral Energy Research (WPIꢀ
I2CNER), Kyushu University, 744 Motooka, Nishi, Fukuoka 819ꢀ0395,
Japan
d
Sumitomo Riko Company, Ltd., Material Technology R&D
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e
Nippon Steel & Sumikin Chemical Co., Ltd., 46ꢀ80, Nakabaru
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f
JST, ERATO, Adachi Molecular Exciton Engineering Project, c/o
OPERA, Kyushu University, 744 Motooka, Nishi, Fukuoka 819ꢀ0395,
Japan
†
Electronic Supplementary Information (ESI) available: Experimental
and synthesis details, additional photophysical data, and supplementary
figures and tables. See DOI: 10.1039/c000000x/
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