Enhancement of the Luminance Efficiency due to an Embedded Self-Assembled Monolayer in Organic Light-Emitting Devices
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概要
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The electrical and optical properties of organic light-emitting devices (OLEDs) with and without a self-assembled monolayer (SAM) were investigated, and the effect of an embedded SAM was clarified. The contact angles of COOH-terminated alkanethiol SAMs were smaller than those of CH<inf>3</inf>-terminated alkanethiol SAMs. The operating voltage of OLEDs with COOH-terminated alkanethiol SAMs was 4.4 V lower than that with CH<inf>3</inf>-terminated alkanethiol SAMs. The luminance of OLEDs with COOH-terminated alkanethiol SAMs was higher than that with CH<inf>3</inf>-terminated alkanethiol SAMs. The enhancement of the luminance efficiency of OLEDs with COOH-terminated alkanethiol SAMs was attributed to the increase in hole injection due to a decrease in the chain length of the COOH-terminated alkanethiols, resulting in a better balance between the numbers of holes and electrons at an emitting layer in the OLEDs.
- 2013-11-25
著者
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Noh Jaegeun
Department Of Chemistry Hanyang University
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Kim Ki
Deparment Of Obstetrics & Gynecology College Of Medicine Pusan National University
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Jeon Young
Department Of Biological Sciences Korea Advanced Institute Of Science And Technology
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Kim Tae
Department of Advanced Materials Engineering, Sungkyunkwan University, Suwon, Gyeonggi 440-746, Republic Korea
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Jeon Young
Department of Electronics and Computer Engineering, Hanyang University, Seoul 133-791, Korea
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Seo Hanmin
Department of Chemistry, Hanyang University, Seoul 133-791, Korea
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Kim Ki
Department of Electronics and Computer Engineering, Hanyang University, Seoul 133-791, Korea
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