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

Po-Chang Wu | Zendy; Chien-Tsung Hou | Zendy; YuCheng Hsiao | Zendy; Wei Lee | Zendy

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

Author(s) -

Po-Chang Wu,

Chien-Tsung Hou,

YuCheng Hsiao,

Wei Lee

Publication year - 2014

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.22.031347

Subject(s) - liquid crystal , materials science , methyl red , dopant , transmittance , ionic liquid , spectroscopy , doping , impurity , absorption (acoustics) , absorption spectroscopy , ultraviolet , optics , ultraviolet visible spectroscopy , analytical chemistry (journal) , optoelectronics , chemistry , nuclear chemistry , chromatography , organic chemistry , catalysis , physics , quantum mechanics , composite material

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.

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