Abstract
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 language | English |
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Pages (from-to) | 31347-31355 |
Number of pages | 9 |
Journal | Optics Express |
Volume | 22 |
Issue number | 25 |
DOIs | |
State | Published - 15 Dec 2014 |