ネマティック液晶の光起電力-3-

概要

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Many types of sensors using liquid crystals have been investigated for applications of liquid crystals, for example, sensors of photo, magnetics, ultrasonic, pressure, etc. Some properties of photoelectromotive force of nematic liquid crystals are reviewed by S. Kurita and S. Sato et al. For application studies of the photo sensor of nematic liquid crystals mixed with dyes, it is necessary to investigate the photoelectromotive force in reference to wave length of incident light. In this paper, the photoelectromotive force of nematic liquid crystals, each of which was mixed with its own dyes, were examined in reference to the wavelength of ultra violet rays. The dyes used in this study were sudan Ⅱ, methyl red and nitrophenol. A period of 60 to 300 seconds was taken for each measurements. The main results are as follows. The value of the photoelectromotive force increased with the light of shorter wavelength. The rise response time for incident lights to cells was shorter with the light of shorter wavelength. Liquid crystal cells including dye of the mixture ratio of 3% by weight had the highest maximum value of the photoelectromotive force and shorter rise response time to incident light in this study.