Light-Stability of Dichroic Guest-Host Cells

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Abstract
Light-stability of liquid crystal color display devices using guest-host interactions were investigated. It was found theoretically as well as experimentally that a decrease of absorbance of the guest-host cell was almost proportional to the exposed light intensity and time while the decrease was not large. Therefore, the lifetime can be calculated by extrapolation from the initial decreasing rate of absorbance obtained from an accelerated life test using an intense light. Various disazo dyes with large dichroic ratios were tested and some stable dyes were found.

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