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Liquid Crystals Volume 42, 2015 - Issue 9
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Original Articles

Homogeneous liquid crystal alignment on poly(vinylidene fluoride-trifluoroethylene) films subjected to ion-beam irradiation

Hong-Gyu ParkInformation Display Device Laboratory, Department of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul, Republic of Korea
,
Young Soo ParkKorea National Convergence Center, Korea Institute of Industrial Technology, 143 Hanggaulro, Sangnok-gu, Ansan-si, Republic of Korea
,
Kyoung Yong ParkKorea National Convergence Center, Korea Institute of Industrial Technology, 143 Hanggaulro, Sangnok-gu, Ansan-si, Republic of Korea
,
Min Sun KimKorea National Convergence Center, Korea Institute of Industrial Technology, 143 Hanggaulro, Sangnok-gu, Ansan-si, Republic of Korea
,
Hae-Chang JeongInformation Display Device Laboratory, Department of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul, Republic of Korea
&
Dae-Shik SeoInformation Display Device Laboratory, Department of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul, Republic of KoreaCorrespondence[email protected]
Pages 1262-1268 | Received 14 Mar 2015, Accepted 21 Apr 2015, Published online: 22 Jun 2015
 
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Abstract

We demonstrate homogeneous and uniform liquid crystal (LC) alignment on poly(vinylidene fluoride-trifluoroethylene) [PVDF-TrFE] films using ion-beam (IB) irradiation and a performance improvement of twisted nematic (TN) cells using IB-irradiated PVDF-TrFE films. Spontaneous ferroelectricity of the PVDF-TrFE films was modified by IB irradiation, which affected the LC alignment properties. The variation in the pre-tilt angles of the LC molecules on the IB-irradiated PVDF films is attributed to surface reformation, including defluorination and oxidation because the pre-tilt angles of LC molecules can be controlled by adjusting the fluorine content. The results of contact angle measurements supported this phenomenon. A 58% reduction in the switching voltage was observed for TN cells, indicating that the IB-irradiated PVDF-TrFE films are a promising candidate for use as an alignment layer.

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