A study of the liquid crystal alignment mechanism of bond-breaking via ion-beam irradiation of an amorphous aluminum-oxide surface

Dai Hyun Kim; Hae Yoon Jung; Young Gu Kang; Young Hwan Kim; Hong Gyu Park; Byoung Yong Kim; Dae Shik Seo

doi:10.1109/JDT.2010.2086432

A study of the liquid crystal alignment mechanism of bond-breaking via ion-beam irradiation of an amorphous aluminum-oxide surface

Dai Hyun Kim, Hae Yoon Jung, Young Gu Kang, Young Hwan Kim, Hong Gyu Park, Byoung Yong Kim, Dae Shik Seo

Department of Electrical and Electronic Engineering

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

4 Citations (Scopus)

Abstract

In this paper, we study the Ion-beam (IB) irradiated amorphous (a)-aluminum oxide (Al₂O₃) inorganic layer deposited by RF magnetron sputtering as an liquid crystal (LC) alignment layer. Uniformly vertical-aligned (VA)-LC on a-Al₂ O₃ surface resulted from IB irradiation energy above 1800 eV. We assumed that LC molecular orientation depends on the intensity of Al 2p, O 1s peaks, which were confirmed through X-ray photoelectron spectroscopy (XPS) measurements. XPS showed that IB irradiation changed the chemical structure, breaking Al-O bonds by altering AlO and OAl bonding intensity. Also, electro-optical characteristics of vertical-aligned-LC displays (VA-LCDs) on the Al₂ O₃ alignment layers were measured, which showed reduced threshold voltage and power consumption, as compared with IB irradiated and rubbed polyimide (PI) layers.

Original language	English
Article number	5688132
Pages (from-to)	19-23
Number of pages	5
Journal	IEEE/OSA Journal of Display Technology
Volume	7
Issue number	1
DOIs	https://doi.org/10.1109/JDT.2010.2086432
Publication status	Published - 2011

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1109/JDT.2010.2086432

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title = "A study of the liquid crystal alignment mechanism of bond-breaking via ion-beam irradiation of an amorphous aluminum-oxide surface",

abstract = "In this paper, we study the Ion-beam (IB) irradiated amorphous (a)-aluminum oxide (Al2O3) inorganic layer deposited by RF magnetron sputtering as an liquid crystal (LC) alignment layer. Uniformly vertical-aligned (VA)-LC on a-Al2 O3 surface resulted from IB irradiation energy above 1800 eV. We assumed that LC molecular orientation depends on the intensity of Al 2p, O 1s peaks, which were confirmed through X-ray photoelectron spectroscopy (XPS) measurements. XPS showed that IB irradiation changed the chemical structure, breaking Al-O bonds by altering AlO and OAl bonding intensity. Also, electro-optical characteristics of vertical-aligned-LC displays (VA-LCDs) on the Al2 O3 alignment layers were measured, which showed reduced threshold voltage and power consumption, as compared with IB irradiated and rubbed polyimide (PI) layers.",

author = "Kim, {Dai Hyun} and Jung, {Hae Yoon} and Kang, {Young Gu} and Kim, {Young Hwan} and Park, {Hong Gyu} and Kim, {Byoung Yong} and Seo, {Dae Shik}",

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doi = "10.1109/JDT.2010.2086432",

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AU - Kim, Dai Hyun

AU - Jung, Hae Yoon

AU - Kang, Young Gu

AU - Kim, Young Hwan

AU - Park, Hong Gyu

AU - Kim, Byoung Yong

AU - Seo, Dae Shik

PY - 2011

Y1 - 2011

N2 - In this paper, we study the Ion-beam (IB) irradiated amorphous (a)-aluminum oxide (Al2O3) inorganic layer deposited by RF magnetron sputtering as an liquid crystal (LC) alignment layer. Uniformly vertical-aligned (VA)-LC on a-Al2 O3 surface resulted from IB irradiation energy above 1800 eV. We assumed that LC molecular orientation depends on the intensity of Al 2p, O 1s peaks, which were confirmed through X-ray photoelectron spectroscopy (XPS) measurements. XPS showed that IB irradiation changed the chemical structure, breaking Al-O bonds by altering AlO and OAl bonding intensity. Also, electro-optical characteristics of vertical-aligned-LC displays (VA-LCDs) on the Al2 O3 alignment layers were measured, which showed reduced threshold voltage and power consumption, as compared with IB irradiated and rubbed polyimide (PI) layers.

AB - In this paper, we study the Ion-beam (IB) irradiated amorphous (a)-aluminum oxide (Al2O3) inorganic layer deposited by RF magnetron sputtering as an liquid crystal (LC) alignment layer. Uniformly vertical-aligned (VA)-LC on a-Al2 O3 surface resulted from IB irradiation energy above 1800 eV. We assumed that LC molecular orientation depends on the intensity of Al 2p, O 1s peaks, which were confirmed through X-ray photoelectron spectroscopy (XPS) measurements. XPS showed that IB irradiation changed the chemical structure, breaking Al-O bonds by altering AlO and OAl bonding intensity. Also, electro-optical characteristics of vertical-aligned-LC displays (VA-LCDs) on the Al2 O3 alignment layers were measured, which showed reduced threshold voltage and power consumption, as compared with IB irradiated and rubbed polyimide (PI) layers.

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A study of the liquid crystal alignment mechanism of bond-breaking via ion-beam irradiation of an amorphous aluminum-oxide surface

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