Application of magnesium fluoride (MgF 2 ) thin films for liquid crystal alignment using ion-beam irradiation

Iee Gon Kim, Hong Gyu Park, Jae Jun Han, Jeong Min Han, Dae-Shik Seo

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

This letter introduces the characteristics of the magnesium fluoride ( MgF 2 ) inorganic film deposited by an electron-beam evaporation system for liquid crystal display (LCD) applications. We first achieved homogeneous liquid crystal (LC) alignment by controlling the ion-beam (IB) irradiation energy intensity. We also showed that MgF 2 is more transparent than spin-coated polyimide (PI) in the visible wavelength. By chemical analysis, IB irradiation selectively broke the Mg-F bonding structure because of the IB energy intensity; thus, the MgF 2 surface was turned to an unstable MgF 2-x surface, resulting in homogeneous LC orientation. Moreover, the electrooptic characteristics of a homogeneously aligned twisted nematic (TN)-LCD on the MgF 2 layer showed good performance as the TN-LCD on the polyimide, showing a strong possibility of the MgF 2 material as an LC alignment layer.

Original languageEnglish
Article number6389705
Pages (from-to)283-285
Number of pages3
JournalIEEE Electron Device Letters
Volume34
Issue number2
DOIs
Publication statusPublished - 2013 Jan 1

Fingerprint

Liquid Crystals
Liquid crystal displays
Liquid crystals
Ion beams
Magnesium
Nematic liquid crystals
Irradiation
Polyimides
Thin films
Electrooptical effects
Crystal orientation
Electron beams
Evaporation
Wavelength
Chemical analysis
magnesium fluoride

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

Kim, Iee Gon ; Park, Hong Gyu ; Han, Jae Jun ; Han, Jeong Min ; Seo, Dae-Shik. / Application of magnesium fluoride (MgF 2 ) thin films for liquid crystal alignment using ion-beam irradiation In: IEEE Electron Device Letters. 2013 ; Vol. 34, No. 2. pp. 283-285.
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Application of magnesium fluoride (MgF 2 ) thin films for liquid crystal alignment using ion-beam irradiation . / Kim, Iee Gon; Park, Hong Gyu; Han, Jae Jun; Han, Jeong Min; Seo, Dae-Shik.

In: IEEE Electron Device Letters, Vol. 34, No. 2, 6389705, 01.01.2013, p. 283-285.

Research output: Contribution to journalArticle

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AB - This letter introduces the characteristics of the magnesium fluoride ( MgF 2 ) inorganic film deposited by an electron-beam evaporation system for liquid crystal display (LCD) applications. We first achieved homogeneous liquid crystal (LC) alignment by controlling the ion-beam (IB) irradiation energy intensity. We also showed that MgF 2 is more transparent than spin-coated polyimide (PI) in the visible wavelength. By chemical analysis, IB irradiation selectively broke the Mg-F bonding structure because of the IB energy intensity; thus, the MgF 2 surface was turned to an unstable MgF 2-x surface, resulting in homogeneous LC orientation. Moreover, the electrooptic characteristics of a homogeneously aligned twisted nematic (TN)-LCD on the MgF 2 layer showed good performance as the TN-LCD on the polyimide, showing a strong possibility of the MgF 2 material as an LC alignment layer.

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