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A New Bis-Cyclometalated Iridium (III) Complex as a Triplet Emitter in Organic Light Emitting Devices

Published online by Cambridge University Press:  01 February 2011

Rupasree R Das ,
Ohyun Kwon ,
Younghun Byun ,
Yi-Yeol Lyu ,
Myeong Suk Kim ,
Heekyung Kim ,
Eun Sil Han ,
Mu Gyum Kim ,
Jong-Jin Park  and
Lyong Sun Pu
Rupasree R Das
Affiliation:
Samsung Advanced Institute of Technology, P. O. Box 111, Suwon, 440-600, Korea
Ohyun Kwon
Affiliation:
Samsung Advanced Institute of Technology, P. O. Box 111, Suwon, 440-600, Korea
Younghun Byun
Affiliation:
Samsung Advanced Institute of Technology, P. O. Box 111, Suwon, 440-600, Korea
Yi-Yeol Lyu
Affiliation:
Samsung Advanced Institute of Technology, P. O. Box 111, Suwon, 440-600, Korea
Myeong Suk Kim
Affiliation:
Samsung Advanced Institute of Technology, P. O. Box 111, Suwon, 440-600, Korea
Heekyung Kim
Affiliation:
Samsung Advanced Institute of Technology, P. O. Box 111, Suwon, 440-600, Korea
Eun Sil Han
Affiliation:
Samsung Advanced Institute of Technology, P. O. Box 111, Suwon, 440-600, Korea
Mu Gyum Kim
Affiliation:
Samsung Advanced Institute of Technology, P. O. Box 111, Suwon, 440-600, Korea
Jong-Jin Park
Affiliation:
Samsung Advanced Institute of Technology, P. O. Box 111, Suwon, 440-600, Korea
Lyong Sun Pu
Affiliation:
Samsung Advanced Institute of Technology, P. O. Box 111, Suwon, 440-600, Korea
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Abstract

We report a new Iridium(III) complex and the study of its optical, electrochemical and electroluminescence properties. The crystal structure shows an octahedral environment around Ir(III) center. Density functional theory (DFT) calculations indicate the contribution of the d-orbitals of Ir and the π-orbitals of the cyclometalating and ancillary ligands toward HOMO, whereas LUMO is concentrated on only the cyclometalating ligand. These complexes emit in the sky blue color region from an admixture of triplet metal-to-ligand-charge-transfer (3MLCT) and ligand π-π* states. A maximum external (ηex) quantumefficiency and luminance efficiency of 2.4% and 5.5 cd/A at 0.12 mA/cm2 was obtained from the device consisting of a 5% doped polymeric and low molecular host. A maximum brightness of 10,200 cd/m2 at 14.8 V was obtained from the device.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 871: Symposium I – Organic Thin-Film Electronics , 2005 , I6.21
Copyright
Copyright © Materials Research Society 2005

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