Enhancing Efficiency of Organic Light-Emitting Diodes Using a Carbon-Nanotube-Doped Hole Injection Layer
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概要
- 論文の詳細を見る
A nanocomposite layer consisting of multiwalled carbon nanotube (MWCNT)-doped poly(3,4,-ethylene dioxythiphene):poly(styrene sulfonic acid) (PEDOT:PSS) was employed as a hole injection layer (HIL) in an organic light-emitting diode (OLED). The structure of the OLED is glass/indium-tin oxide (ITO)/MWCNT-doped PEDOT:PSS/PEDOT:PSS/tris(8-hydroxyquinolinato)aluminum (Alq3)/LiF/Al. The luminous efficiency of the OLED is as high as 2.1 cd/A, which is 70% higher than that of a conventional device without an MWCNTs-doped HIL. The MWCNTs in the PEDOT:PSS act as a hole-blocking material that results in a reduction in holes transport ability, and therefore, in a balance between electron and hole mobilities, leading to enhanced luminescent performance. The mechanism was well demonstrated by through investigations by atomic force microscopy (AFM) of the film surface morphology and carrier injection properties of hole-only devices.
- 2010-04-25
著者
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SU Shui-Hsiang
Department of Electronic Engineering
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HOU Cheng-Chieh
Department of Electronic Engineering
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CHIANG Wang-Ta
Department of Electronic Engineering, I-Shou University
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Meiso Yokoyama
Department of Electronic Engineering, I-Shou University, Kaohsiung County, Taiwan 840, R.O.C.
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Lien-Cheng Kao
Department of Electronic Engineering, I-Shou University, Kaohsiung County, Taiwan 840, R.O.C.
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Cheng-Chieh Hou
Department of Electronic Engineering, I-Shou University, Kaohsiung County, Taiwan 840, R.O.C.
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Meiso Yokoyama
Department of Electronic Engineering, I-Shou University, Kaohsiung County 840, Taiwan, Republic of China
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