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

11 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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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.",

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AU - Wang, Ying

AU - Gao, Weiying

AU - Braun, Slawomir

AU - Salaneck, William R.

AU - Amy, Fabrice

AU - Chan, Calvin

AU - Kahn, Antoine

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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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