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

doi:10.1080/02678292.2014.889233

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

Department of Electrical and Electronic Engineering

Research output: Contribution to journal › Article › peer-review

45 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 language	English
Pages (from-to)	761-767
Number of pages	7
Journal	Liquid Crystals
Volume	41
Issue number	6
DOIs	https://doi.org/10.1080/02678292.2014.889233
Publication status	Published - 2014 Jun

All Science Journal Classification (ASJC) codes

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

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10.1080/02678292.2014.889233

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title = "Superior fast switching of liquid crystal devices using graphene quantum dots",

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.",

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

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T1 - Superior fast switching of liquid crystal devices using graphene quantum dots

AU - Cho, Min Jae

AU - Park, Hong Gyu

AU - Jeong, Hae Chang

AU - Lee, Jae Won

AU - Jung, Yoon Ho

AU - Kim, Dai Hyun

AU - Kim, Jeong Hwan

AU - Lee, Jin Woo

AU - Seo, Dae Shik

PY - 2014/6

Y1 - 2014/6

N2 - 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.

AB - 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.

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Superior fast switching of liquid crystal devices using graphene quantum dots

Abstract

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