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 Brédas; Seth R. Marder

doi:10.1080/154214090892609

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 Brédas, Seth R. Marder

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-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 language	English (US)
Pages (from-to)	17-32
Number of pages	16
Journal	Molecular Crystals and Liquid Crystals
Volume	428
DOIs	https://doi.org/10.1080/154214090892609
State	Published - 2005
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

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10.1080/154214090892609

Cite this

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title = "Colorless molecular dopants for low-operating-voltage nematic liquid crystals",

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.",

keywords = "Colorless dopants, Dielectric anisotropy, Nematic liquid crystal, Order parameter, Steric hindrance, Threshold voltage",

author = "Haddock, {Joshua N.} and Bernard Kippelen and Mathine, {David L.} and Johanna Schmidtke and Sriram Kumaraswamy and Marder, {Seth R.} and Ohyun Kwon and Egbert Zojer and Br{\'e}das, {Jean Luc} and Marder, {Seth R.}",

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doi = "10.1080/154214090892609",

language = "English (US)",

volume = "428",

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TY - JOUR

T1 - Colorless molecular dopants for low-operating-voltage nematic liquid crystals

AU - Haddock, Joshua N.

AU - Kippelen, Bernard

AU - Mathine, David L.

AU - Schmidtke, Johanna

AU - Kumaraswamy, Sriram

AU - Marder, Seth R.

AU - Kwon, Ohyun

AU - Zojer, Egbert

AU - Brédas, Jean Luc

AU - Marder, Seth R.

PY - 2005

Y1 - 2005

N2 - 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.

AB - 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.

KW - Colorless dopants

KW - Dielectric anisotropy

KW - Nematic liquid crystal

KW - Order parameter

KW - Steric hindrance

KW - Threshold voltage

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U2 - 10.1080/154214090892609

DO - 10.1080/154214090892609

M3 - Article

AN - SCOPUS:18144425577

SN - 1542-1406

VL - 428

SP - 17

EP - 32

JO - Molecular Crystals and Liquid Crystals

JF - Molecular Crystals and Liquid Crystals

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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