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 journalArticlepeer-review

45 Citations (Scopus)


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
Issue number6
Publication statusPublished - 2014 Jun

All Science Journal Classification (ASJC) codes

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


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