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

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

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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

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All Science Journal Classification (ASJC) codes

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

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