Electrochromic devices with bipyridinium salt solutions

Details Electrochromic devices with bipyridinium salt solutions Electrochromic devices with bipyridinium salt solutions

1991-06-25

1994-08-09

Tucker, Philip

Compositions

Light transmission modifying compositions

Modification caused by energy other than light

359265, 359272, 359275, G02F 101, G02F 100

Patent

active

053364481

ABSTRACT:
The present invention provides solution-phase electrochromic devices, including such devices that are single-compartment and self-erasing, in which the media of variable transmittance are solutions comprising, as cathodic electrochromic compounds, certain 4,4'-bipyridinium salts, such as salts of 1,1'-dibenzyl-2,2',6,6'-tetraalkyl-4,4'-bipyridinium cations. Electrochromic devices of the invention are components of variable transmittance in display devices, windows and other types of light filters, and variable reflectance mirrors, such as those that can be used as dimmable rearview mirrors in motor vehicles.

REFERENCES:
patent: 3652149 (1972-03-01), Rogers
patent: 4606798 (1986-08-01), Sasse et al.
patent: 4902108 (1990-02-01), Byker
Barltrop et al., J. Chem. Soc. Perkin Trans. II pp. 367-371, (1984).
Jackson et al., J. Electoanal. Chem., No. 159, pp. 325-335, (1983).
Carey, J., Chemical Abstracts 46097j, vol. 76, (1972).

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