Effect of photoreactive SAM at the interface of an indium-tin oxide electrode and a polymer hole transport layer

Seong Ho Kim; Hanae Ohtsuka; Rigoberto C. Advincula; Kuniaki Tanaka; Hiroaki Usui

doi:10.1587/transele.E96.C.365

Effect of photoreactive SAM at the interface of an indium-tin oxide electrode and a polymer hole transport layer

Seong Ho Kim^*, Hanae Ohtsuka, Rigoberto C. Advincula, Kuniaki Tanaka, Hiroaki Usui

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

A self-assembled monolayer having a benzophenone unit as a photoreactive terminal group (BP-SAM) was prepared on an indiumtin oxide (ITO) electrode, on which a hole-transport layer of a phenoxazinedioctylfluorene 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.

Original language	English
Pages (from-to)	365-368
Number of pages	4
Journal	IEICE Transactions on Electronics
Volume	E96-C
Issue number	3
DOIs	https://doi.org/10.1587/transele.E96.C.365
Publication status	Published - 2013
Externally published	Yes

Keywords

Bonzophenone
Hole-transport layer
Interface
OLED
SAM

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1587/transele.E96.C.365

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title = "Effect of photoreactive SAM at the interface of an indium-tin oxide electrode and a polymer hole transport layer",

abstract = "A self-assembled monolayer having a benzophenone unit as a photoreactive terminal group (BP-SAM) was prepared on an indiumtin oxide (ITO) electrode, on which a hole-transport layer of a phenoxazinedioctylfluorene 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.",

keywords = "Bonzophenone, Hole-transport layer, Interface, OLED, SAM",

author = "Kim, {Seong Ho} and Hanae Ohtsuka and Advincula, {Rigoberto C.} and Kuniaki Tanaka and Hiroaki Usui",

year = "2013",

doi = "10.1587/transele.E96.C.365",

language = "English",

volume = "E96-C",

pages = "365--368",

journal = "IEICE Transactions on Electronics",

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T1 - Effect of photoreactive SAM at the interface of an indium-tin oxide electrode and a polymer hole transport layer

AU - Kim, Seong Ho

AU - Ohtsuka, Hanae

AU - Advincula, Rigoberto C.

AU - Tanaka, Kuniaki

AU - Usui, Hiroaki

PY - 2013

Y1 - 2013

N2 - A self-assembled monolayer having a benzophenone unit as a photoreactive terminal group (BP-SAM) was prepared on an indiumtin oxide (ITO) electrode, on which a hole-transport layer of a phenoxazinedioctylfluorene 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.

AB - A self-assembled monolayer having a benzophenone unit as a photoreactive terminal group (BP-SAM) was prepared on an indiumtin oxide (ITO) electrode, on which a hole-transport layer of a phenoxazinedioctylfluorene 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.

KW - Bonzophenone

KW - Hole-transport layer

KW - Interface

KW - OLED

KW - SAM

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SN - 0916-8524

VL - E96-C

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JO - IEICE Transactions on Electronics

JF - IEICE Transactions on Electronics

IS - 3

ER -

Effect of photoreactive SAM at the interface of an indium-tin oxide electrode and a polymer hole transport layer

Abstract

Keywords

ASJC Scopus subject areas

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