Browsing by Author "Hou, Chien-Tsung"

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Influence of methyl red as a dopant on the electrical properties and device performance of liquid crystals
(2014-12-15)
Wu, Po-Chang
;
Hou, Chien-Tsung
;
Hsiao, Yu-Cheng
;
Lee, Wei
;
影像與生醫光電研究所
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. (C)2014 Optical Society of America