Effect of Photoreactive SAM at the Interface of an Indium-Tin Oxide Electrode and a Polymer Hole Transport Layer
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概要
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A self-assembled monolayer having a benzophenone unit as a photoreactive terminal group (BP-SAM) was prepared on an indium-tin oxide (ITO) electrode, on which a hole-transport layer of a phenoxazine-dioctylfluorene copolymer (H5) was spin-coated and irradiated with UV light. After washing the physisorbed H5 molecules, contact angle measurement and ellipsometry showed that the H5 molecules can be tethered to the ITO surface via the BP-SAM. Organic light-emitting diodes (OLEDs) were prepared in the structure of ITO/H5 hole transport layer/tris(8-hydroxyquinolato) aluminum/bathocuproin/LiF/Al electrode with and without the BP-SAM layer on the surface of ITO. The device with the BP-SAM showed higher current density and higher luminance due to the improvement of contact at the ITO/H5 interface by forming covalent bonds via the BP-SAM.
著者
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Usui Hiroaki
Department Of Material Systems Engineering Tokyo University Of Agriculture And Technology
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Kim Seong-ho
Department Of Internal Medicine Dongguk University College Of Medicine
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Tanaka Kuniaki
Department Of Biological Science Faculty Of Agriculture Shizuoka University
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C. ADVINCULA
Department of Macromolecular Science and Engineering, Case Western Reserve University
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OHTSUKA Hanae
Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology
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