Properties of nematic liquid crystals doped with hydroquinone and p-benzoquinone: Long-term dynamic scattering under dc excitation

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Abstract
The effect of a charge‐transfer complex pair on dynamic scattering (DS) properties in nematic liquid crystals is reported. With the use of a hydroquinone‐quinone complex pair as dopant, more than one‐year continuous dc operation of DS has been achieved. Purification of materials and use of hermetically sealed cells are necessary. Since nematics doped with conventional organic electrolytes do not show long lives under dc operation, a reversible oxidation‐reduction process was found to play a fundamental role in achieving long dc operation lives of DS in the present nematics. The mechanism of the electrochemical process in DS is briefly discussed.