Superior fast switching of liquid crystal devices using graphene quantum dots

Min Jae Cho, Hong Gyu Park, Hae Chang Jeong, Jae Won Lee, Yoon Ho Jung, Dai Hyun Kim, Jeong Hwan Kim, Jin Woo Lee, Dae Shik Seo

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We report the doping effect of graphene quantum dots (QDs) in a nematic liquid crystal (NLC) device. The use of graphene QDs leads to improved electro-optical (EO) properties, such as faster response times and a decreased threshold voltage. A 14.8% reduction in the threshold voltage (3.165 V), a 30% decrease in the falling time (4.9 ms) and a 63.6% decrease in the rising time (2.4 ms) were observed for twisted nematic (TN) LC devices (LCDs) that were doped with QDs. We confirm that the doping of the TN-LCD with graphene QDs reduces the field-screening effect, which is caused by impurity ions, whereas the other properties of conventional TN-LCDs are maintained.

Original languageEnglish
Pages (from-to)761-767
Number of pages7
JournalLiquid Crystals
Volume41
Issue number6
DOIs
Publication statusPublished - 2014 Jan 1

Fingerprint

Liquid Crystals
Liquid crystals
Semiconductor quantum dots
Graphite
graphene
liquid crystals
quantum dots
Graphene
Threshold voltage
threshold voltage
Doping (additives)
Nematic liquid crystals
falling
Screening
screening
Optical properties
Impurities
Ions
optical properties
impurities

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Cho, M. J., Park, H. G., Jeong, H. C., Lee, J. W., Jung, Y. H., Kim, D. H., ... Seo, D. S. (2014). Superior fast switching of liquid crystal devices using graphene quantum dots. Liquid Crystals, 41(6), 761-767. https://doi.org/10.1080/02678292.2014.889233
Cho, Min Jae ; Park, Hong Gyu ; Jeong, Hae Chang ; Lee, Jae Won ; Jung, Yoon Ho ; Kim, Dai Hyun ; Kim, Jeong Hwan ; Lee, Jin Woo ; Seo, Dae Shik. / Superior fast switching of liquid crystal devices using graphene quantum dots. In: Liquid Crystals. 2014 ; Vol. 41, No. 6. pp. 761-767.
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Cho, MJ, Park, HG, Jeong, HC, Lee, JW, Jung, YH, Kim, DH, Kim, JH, Lee, JW & Seo, DS 2014, 'Superior fast switching of liquid crystal devices using graphene quantum dots', Liquid Crystals, vol. 41, no. 6, pp. 761-767. https://doi.org/10.1080/02678292.2014.889233

Superior fast switching of liquid crystal devices using graphene quantum dots. / Cho, Min Jae; Park, Hong Gyu; Jeong, Hae Chang; Lee, Jae Won; Jung, Yoon Ho; Kim, Dai Hyun; Kim, Jeong Hwan; Lee, Jin Woo; Seo, Dae Shik.

In: Liquid Crystals, Vol. 41, No. 6, 01.01.2014, p. 761-767.

Research output: Contribution to journalArticle

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