Enhancement of iridium-based organic light-emitting diodes by spatial doping of the hole transport layer

Ying Wang; Weiying Gao; Slawomir Braun; William R. Salaneck; Fabrice Amy; Calvin Chan; Antoine Kahn

doi:10.1063/1.2117623

Enhancement of iridium-based organic light-emitting diodes by spatial doping of the hole transport layer

Ying Wang
, Weiying Gao
, Slawomir Braun
, William R. Salaneck
, Fabrice Amy
, Calvin Chan
, Antoine Kahn

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

The electroluminescence efficiency of Ir-based green emitter devices is very sensitive to the nature of the hole transport layer used. We show that by inserting a 1 nm layer of bis[4-(N,N-diethylamino)-2-methylphenyl](4- methylphenyl)methane (MPMP) in a 4, 4′ - bis- (carbazol-9-yl) biphenyl (CBP) hole transport layer, a device that combines the positive attributes of both MPMP (high efficiency) and CBP (low injection voltage) is obtained. These results can be understood based on a combined ultraviolet photoemission spectroscopy/inverse photoemission spectroscopy study, which reveals the very low electron affinity and superior electron blocking capability of MPMP.

Original language	English (US)
Article number	193501
Pages (from-to)	1-3
Number of pages	3
Journal	Applied Physics Letters
Volume	87
Issue number	19
DOIs	https://doi.org/10.1063/1.2117623
State	Published - Nov 7 2005

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.2117623

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@article{43e127b9a1d545d29ddc6100e4416504,

title = "Enhancement of iridium-based organic light-emitting diodes by spatial doping of the hole transport layer",

abstract = "The electroluminescence efficiency of Ir-based green emitter devices is very sensitive to the nature of the hole transport layer used. We show that by inserting a 1 nm layer of bis[4-(N,N-diethylamino)-2-methylphenyl](4- methylphenyl)methane (MPMP) in a 4, 4′ - bis- (carbazol-9-yl) biphenyl (CBP) hole transport layer, a device that combines the positive attributes of both MPMP (high efficiency) and CBP (low injection voltage) is obtained. These results can be understood based on a combined ultraviolet photoemission spectroscopy/inverse photoemission spectroscopy study, which reveals the very low electron affinity and superior electron blocking capability of MPMP.",

author = "Ying Wang and Weiying Gao and Slawomir Braun and Salaneck, \{William R.\} and Fabrice Amy and Calvin Chan and Antoine Kahn",

note = "Funding Information: The authors thank Dr. V. Grushin for providing the compound, and Dr. N. Herron for providing the MPMP compound. Technical assistance from C. Adams and G. Young is greatly appreciated. The Princeton group is grateful for support for this work by the National Science Foundation (DMR-0408589) and E. I. DuPont Corp. S.B. is supported by a contract with E. I. DuPont Corp. Research in Link{\"o}ping is supported by the European Commission within the Integrated Project NAIMO (NMP4-CT-2004-500355), the Swedish Research Council (VR), as well as the Center for Advanced Molecular Materials, CAMM, and the Center of Organic Electronics (COE), both of which are funded by the Swedish Foundation for Strategic Research, SSF.",

year = "2005",

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doi = "10.1063/1.2117623",

language = "English (US)",

volume = "87",

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journal = "Applied Physics Letters",

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T1 - Enhancement of iridium-based organic light-emitting diodes by spatial doping of the hole transport layer

AU - Wang, Ying

AU - Gao, Weiying

AU - Braun, Slawomir

AU - Salaneck, William R.

AU - Amy, Fabrice

AU - Chan, Calvin

AU - Kahn, Antoine

N1 - Funding Information: The authors thank Dr. V. Grushin for providing the compound, and Dr. N. Herron for providing the MPMP compound. Technical assistance from C. Adams and G. Young is greatly appreciated. The Princeton group is grateful for support for this work by the National Science Foundation (DMR-0408589) and E. I. DuPont Corp. S.B. is supported by a contract with E. I. DuPont Corp. Research in Linköping is supported by the European Commission within the Integrated Project NAIMO (NMP4-CT-2004-500355), the Swedish Research Council (VR), as well as the Center for Advanced Molecular Materials, CAMM, and the Center of Organic Electronics (COE), both of which are funded by the Swedish Foundation for Strategic Research, SSF.

PY - 2005/11/7

Y1 - 2005/11/7

N2 - The electroluminescence efficiency of Ir-based green emitter devices is very sensitive to the nature of the hole transport layer used. We show that by inserting a 1 nm layer of bis[4-(N,N-diethylamino)-2-methylphenyl](4- methylphenyl)methane (MPMP) in a 4, 4′ - bis- (carbazol-9-yl) biphenyl (CBP) hole transport layer, a device that combines the positive attributes of both MPMP (high efficiency) and CBP (low injection voltage) is obtained. These results can be understood based on a combined ultraviolet photoemission spectroscopy/inverse photoemission spectroscopy study, which reveals the very low electron affinity and superior electron blocking capability of MPMP.

AB - The electroluminescence efficiency of Ir-based green emitter devices is very sensitive to the nature of the hole transport layer used. We show that by inserting a 1 nm layer of bis[4-(N,N-diethylamino)-2-methylphenyl](4- methylphenyl)methane (MPMP) in a 4, 4′ - bis- (carbazol-9-yl) biphenyl (CBP) hole transport layer, a device that combines the positive attributes of both MPMP (high efficiency) and CBP (low injection voltage) is obtained. These results can be understood based on a combined ultraviolet photoemission spectroscopy/inverse photoemission spectroscopy study, which reveals the very low electron affinity and superior electron blocking capability of MPMP.

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JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 19

M1 - 193501

ER -

Enhancement of iridium-based organic light-emitting diodes by spatial doping of the hole transport layer

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