Liquid crystal orientation mechanism and tilt angle transition behavior on homeotropic polymer surfaces due to ion beam treatment

Sang Keuk Lee, Byeong Yun Oh, Young Hwan Kim, Chul Ho Ok, Byoung Yong Kim, Jeong Yeon Hwang, Dae-Shik Seo

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We examined the transition behavior of the tilt angle on homeotropic polyimide (PI) surfaces as a function of ion beam (IB) irradiation incident angle. We also investigated the liquid crystal (LC) orientation mechanism by X-ray photoelectron spectroscopy. The tilt angles of the IB-irradiated PI surfaces were controlled in the range of 82-90° as functions of IB irradiation time and incident angle. The largest deviation from the homeotropic alignment was achieved at an IB incident angle of 45°. The plot of the atomic percentage of C-O binding energy versus IB incident angle was shaped like an upward-pointing triangle, while that of the C=O binding energy versus IB incident angle was the reverse. The tilt angle behavior as a function of IB incident angle was similar to the atomic percentage behavior. The LC alignment with IB irradiation was due to the dipole-dipole interaction between the C-O single bonds and the LC molecules. An excellent voltage-transmittance curve for the vertical alignment (VA)-LC cells was observed with a threshold voltage behavior related to the tilt angle. Suitable response time characteristics were measured for VA-LC cells treated with IB irradiation

Original languageEnglish
Article number011502
JournalJapanese Journal of Applied Physics
Volume48
Issue number1
DOIs
Publication statusPublished - 2009 Jan 20

Fingerprint

Crystal orientation
Liquid crystals
Ion beams
ion beams
liquid crystals
polymers
Polymers
Irradiation
alignment
irradiation
Binding energy
Polyimides
polyimides
binding energy
dipoles
Beam plasma interactions
Threshold voltage
cells
triangles
threshold voltage

All Science Journal Classification (ASJC) codes

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

Cite this

Lee, Sang Keuk ; Oh, Byeong Yun ; Kim, Young Hwan ; Ok, Chul Ho ; Kim, Byoung Yong ; Hwang, Jeong Yeon ; Seo, Dae-Shik. / Liquid crystal orientation mechanism and tilt angle transition behavior on homeotropic polymer surfaces due to ion beam treatment. In: Japanese Journal of Applied Physics. 2009 ; Vol. 48, No. 1.
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Liquid crystal orientation mechanism and tilt angle transition behavior on homeotropic polymer surfaces due to ion beam treatment. / Lee, Sang Keuk; Oh, Byeong Yun; Kim, Young Hwan; Ok, Chul Ho; Kim, Byoung Yong; Hwang, Jeong Yeon; Seo, Dae-Shik.

In: Japanese Journal of Applied Physics, Vol. 48, No. 1, 011502, 20.01.2009.

Research output: Contribution to journalArticle

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AU - Hwang, Jeong Yeon

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