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http://dx.doi.org/10.17661/jkiiect.2018.11.6.671

Liquid crystal alignment on rubbed self-assembled monolayers with fluorinated alkyl chain  

Oh, Chan-Woo (School of Electrical, Electronic and Control Engineering, Changwon National University)
Hwang, Seok-Gon (School of Electrical, Electronic and Control Engineering, Changwon National University)
Park, Sang-Geon (Division of Smart Electrical and Electronic Engineering, Silla University)
Park, Hong-Gyu (School of Electrical, Electronic and Control Engineering, Changwon National University)
Publication Information
The Journal of Korea Institute of Information, Electronics, and Communication Technology / v.11, no.6, 2018 , pp. 671-677 More about this Journal
Abstract
In this paper, we investigated the vertical alignment characteristics of liquid crystals (LCs) on fluorinated self-assembled monolayers (FSAMs). For comparison, a commercialized homeotropic polyimide (PI) layer was used as an LC alignment layer. We confirmed the successful deposition of FSAMs and the change of FSAMs before and after rubbing treatment through contact angle measurement and atomic force microscopy. The optical transmittance spectrum of the FSAMs is similar to that of the homeotropic PI layer, which is a superior optical characteristic applicable to LC devices. When FSAMs were applied to the vertically aligned (VA) LC cell, uniform and vertical LC alignments were achieved. In addition, the voltage-transmittance characteristic of VA LC cell with FSAMs was superior to that of VA LC cell with the conventional homeotropic PI layers. These results indicate that the FSAMs are suitable as the homeotropic LC alignment layer for enhanced LC devices.
Keywords
fluorinated self-assembled monolayers; homeotropic alignment; liquid crystal alignment; rubbing treatment; voltage-transmittance characteristics;
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