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

Research output: Contribution to journalArticle

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 languageEnglish
Article number5688132
Pages (from-to)19-23
Number of pages5
JournalIEEE/OSA Journal of Display Technology
Volume7
Issue number1
DOIs
Publication statusPublished - 2011 Feb 10

All Science Journal Classification (ASJC) codes

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

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