Influence of methyl red as a dopant on the electrical properties and device performance of liquid crystals

Po Chang Wu, Chien Tsung Hou, Yu Cheng Hsiao, Wei Lee

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The ionic effect in nematic liquid-crystal (LC) cells containing the azo dye methyl red was investigated by means of dielectric spectroscopy, measurements of voltage holding ratio (VHR) and ultraviolet/visible absorption spectroscopy. The experimental results indicated that incorporating a minute amount of the methyl red (< 0.03 wt%) in the LC host leads to the suppression of the ionic effect caused by impurity ions. Practically, the doped LC cells with a dye content of 0.02 wt% showed improved VHR and promoted lifetime by 15% and 180%, respectively, in virtually no expense of the optical transmittance.

Original languageEnglish
Pages (from-to)31347-31355
Number of pages9
JournalOptics Express
Issue number25
Publication statusPublished - Jan 1 2014
Externally publishedYes


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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