Electrochromic characteristics of liquid-crystal materials

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Abstract
The time dependence of optical density during a coloration and bleaching sequence has been investigated in the isotropic phase for several liquid-crystalline materials doped with a small amount of tetra-n-alkyl-ammonium iodide. As a result, a rate equation fitting experimental results obtained for low current densities has been derived: dOD/dt=αJ−κ(OD+OD0), where OD is the change in optical density of colored cells after the application of dc current, J is the applied current density, α is a coefficient related to the coloration rate, κ is a coefficient governing the bleaching rate, and OD0 is a constant for a given cell. Furthermore, the dependence of these coefficients upon electrolyte concentration, cell thickness, and cell temperature has been studied. The value of α is almost independent of device parameters, while κ is dependent upon the latter two parameters.

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