Application of magnesium fluoride (MgF2) 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

doi:10.1109/LED.2012.2230608

Application of magnesium fluoride (MgF₂) 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

Department of Electrical and Electronic Engineering

Research output: Contribution to journal › Article

7 Citations (Scopus)

Abstract

This letter introduces the characteristics of the magnesium fluoride ( MgF₂) 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 MgF₂ 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 MgF₂ 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 MgF₂ layer showed good performance as the TN-LCD on the polyimide, showing a strong possibility of the MgF₂ material as an LC alignment layer.

Original language	English
Article number	6389705
Pages (from-to)	283-285
Number of pages	3
Journal	IEEE Electron Device Letters
Volume	34
Issue number	2
DOIs	https://doi.org/10.1109/LED.2012.2230608
Publication status	Published - 2013

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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Kim, I. G., Park, H. G., Han, J. J., Han, J. M., & Seo, D. S. (2013). Application of magnesium fluoride (MgF₂) thin films for liquid crystal alignment using ion-beam irradiation. IEEE Electron Device Letters, 34(2), 283-285. [6389705]. https://doi.org/10.1109/LED.2012.2230608

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abstract = "This letter introduces the characteristics of the magnesium fluoride ( MgF2) 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 MgF2 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 MgF2 surface was turned to an unstable MgF2-x surface, resulting in homogeneous LC orientation. Moreover, the electrooptic characteristics of a homogeneously aligned twisted nematic (TN)-LCD on the MgF2 layer showed good performance as the TN-LCD on the polyimide, showing a strong possibility of the MgF2 material as an LC alignment layer.",

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