Vertical liquid crystal orientation on amorphous tantalum pentoxide surfaces depending on anisotropic dipole-dipole interaction via ion beam irradiation

Jong Jin Lee, Hyungjun Kim, Young Gu Kang, Young Hwan Kim, Hong Gyu Park, Byoung Yong Kim, Dae-Shik Seo

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We achieved vertically aligned (VA) liquid crystals (LCs) on amorphous tantalum pentoxide (Ta2O5) alignment films deposited by radio frequency (rf) magnetron sputtering using ion beam (IB) irradiation. By analyzing measurements by X-ray photoelectron spectroscopy (XPS), we confirmed the bond breaking, as detected from the O 1s spectra, which caused an isotropic dipole-dipole interaction between the LC molecules and the Ta2O5 alignment film to uniformly align the vertical LC molecular orientation as a function of IB energy density. Moreover, by examining the electro-optical (EO) characteristics of the Ta2O5 surfaces compared with those of the polyimide (PI) alignment layer, we confirmed that Ta2O5 has a low threshold voltage and a low power consumption when used as an LC alignment layer.

Original languageEnglish
Article number031701
JournalJapanese Journal of Applied Physics
Volume50
Issue number3
DOIs
Publication statusPublished - 2011 Mar 1

Fingerprint

Tantalum
Beam plasma interactions
tantalum
Crystal orientation
Liquid crystals
Ion beams
ion beams
liquid crystals
alignment
Irradiation
dipoles
irradiation
interactions
Molecular orientation
Threshold voltage
polyimides
Polyimides
threshold voltage
Magnetron sputtering
low voltage

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

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title = "Vertical liquid crystal orientation on amorphous tantalum pentoxide surfaces depending on anisotropic dipole-dipole interaction via ion beam irradiation",
abstract = "We achieved vertically aligned (VA) liquid crystals (LCs) on amorphous tantalum pentoxide (Ta2O5) alignment films deposited by radio frequency (rf) magnetron sputtering using ion beam (IB) irradiation. By analyzing measurements by X-ray photoelectron spectroscopy (XPS), we confirmed the bond breaking, as detected from the O 1s spectra, which caused an isotropic dipole-dipole interaction between the LC molecules and the Ta2O5 alignment film to uniformly align the vertical LC molecular orientation as a function of IB energy density. Moreover, by examining the electro-optical (EO) characteristics of the Ta2O5 surfaces compared with those of the polyimide (PI) alignment layer, we confirmed that Ta2O5 has a low threshold voltage and a low power consumption when used as an LC alignment layer.",
author = "Lee, {Jong Jin} and Hyungjun Kim and Kang, {Young Gu} and Kim, {Young Hwan} and Park, {Hong Gyu} and Kim, {Byoung Yong} and Dae-Shik Seo",
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language = "English",
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issn = "0021-4922",
publisher = "Japan Society of Applied Physics",
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Vertical liquid crystal orientation on amorphous tantalum pentoxide surfaces depending on anisotropic dipole-dipole interaction via ion beam irradiation. / Lee, Jong Jin; Kim, Hyungjun; Kang, Young Gu; Kim, Young Hwan; Park, Hong Gyu; Kim, Byoung Yong; Seo, Dae-Shik.

In: Japanese Journal of Applied Physics, Vol. 50, No. 3, 031701, 01.03.2011.

Research output: Contribution to journalArticle

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AU - Lee, Jong Jin

AU - Kim, Hyungjun

AU - Kang, Young Gu

AU - Kim, Young Hwan

AU - Park, Hong Gyu

AU - Kim, Byoung Yong

AU - Seo, Dae-Shik

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AB - We achieved vertically aligned (VA) liquid crystals (LCs) on amorphous tantalum pentoxide (Ta2O5) alignment films deposited by radio frequency (rf) magnetron sputtering using ion beam (IB) irradiation. By analyzing measurements by X-ray photoelectron spectroscopy (XPS), we confirmed the bond breaking, as detected from the O 1s spectra, which caused an isotropic dipole-dipole interaction between the LC molecules and the Ta2O5 alignment film to uniformly align the vertical LC molecular orientation as a function of IB energy density. Moreover, by examining the electro-optical (EO) characteristics of the Ta2O5 surfaces compared with those of the polyimide (PI) alignment layer, we confirmed that Ta2O5 has a low threshold voltage and a low power consumption when used as an LC alignment layer.

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