Colorless molecular dopants for low-operating-voltage nematic liquid crystals

Joshua N. Haddock, Bernard Kippelen*, David L. Mathine, Johanna Schmidtke, Sriram Kumaraswamy, Seth R. Marder, Ohyun Kwon, Egbert Zojer, Jean-Luc Bredas, Seth R. Marder

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

In this paper we present a study of two similar, colorless molecular dopants designed to decrease the operating voltages of nematic liquid crystals by increasing the dielectric anisotropy. Experimental analysis shows that these materials reduced the threshold voltage (voltage associated with the Freedericksz transition) by up to 20%, but via a reduction in the liquid crystal order parameter. To gain insight into the decrease of the order parameter, we used density-functional and single-point MP2 theory to investigate the conformational preferences of our dopants; the calculations suggest that, because of steric interactions, the conformations adopted are rather rigid.

Original languageEnglish (US)
Pages (from-to)17-32
Number of pages16
JournalMolecular crystals and liquid crystals
Volume428
DOIs
StatePublished - May 17 2005

Keywords

  • Colorless dopants
  • Dielectric anisotropy
  • Nematic liquid crystal
  • Order parameter
  • Steric hindrance
  • Threshold voltage

ASJC Scopus subject areas

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

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