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.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
Wu, P. C., Hou, C. T., Hsiao, Y. C., & Lee, W. (2014). Influence of methyl red as a dopant on the electrical properties and device performance of liquid crystals. Optics Express, 22(25), 31347-31355. https://doi.org/10.1364/OE.22.031347