Interface Control by Surface-Initiated Deposition Polymerization and Its Application to Organic Light-Emitting Devices
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概要
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Surface-initiated deposition polymerization was applied to the preparation of a hole transport layer (HTL) on an indium–tin oxide (ITO) electrode. A silane-based self-assembled monolayer (SAM) that has an azo terminal group was prepared on an ITO surface on which a vinyl monomer of carbazole (CPA) or tetraphenyldiaminobiphenyl (vTPD) was deposited by physical vapor deposition. The polymerization of the HTL was achieved by electron-assisted deposition. UV irradiation, as well as conventional evaporation, was not capable of growing polymer films on the SAM. Organic light-emitting diodes (OLEDs) were prepared by depositing tris(8-quinolinolato) aluminum (Alq3) on the HTL. The surface-initiated deposition polymerization was effective in markedly increasing device current flow and reducing turn-on voltage. However, luminescence efficiency was not improved by this method owing to improper carrier balance under excessive hole injection. Nevertheless, surface-initiated deposition polymerization was effective in improving film morphology, stability, and hole injection characteristics.
- 2008-04-25
著者
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Advincula Rigoberto
University Of Houston
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Ogino Kenji
Tokyo Univ. Agriculture And Technol. Tokyo Jpn
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Usui Hiroaki
Tokyo Institute Of Technology Department Of Textile And Polymeric Materials
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KAWAKAMI Akira
Tokyo University of Agriculture and Technology, Department of Organic and Polymer Materials Chemistr
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Tanaka Kuniaki
Tokyo Univ. Agriculture And Technol. Tokyo Jpn
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Katsuki Kiyoi
Tokyo University Of Agriculture And Technology Department Of Organic And Polymer Materials Chemistry
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Advincula Rigoberto
University of Houston, 136 Fleming Building, Houston, TX 77204-5008, U.S.A.
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Katsuki Kiyoi
Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan
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