Electrochromic media for producing a preselected color
AssigneeGentex Corporation
InventorsHarlan J. Byker, Thomas F. Guarr, Derick D. Winkle
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Abstract
Electrochromic compositions suitable for use in electrochromic media in electrochromic devices contain minimally two electrochromic compounds of the same redox type, whose redox potentials are greater than 30 mV. The lower redox potential electrochromic compound makes a large contribution to the absorbancy of the electrochromic medium despite being present in only minor concentration.
Claims32
An electrochromic medium capable of producing a pre-selected color, comprising at least three electroactive compounds, two of which are of the same redox type and another which is of a complementary redox type, where one of said two electroactive compounds of the same redox type has a more easily accessible electrochemically activated redox state than the other by minimally 30 mV, and where two of the at least three electroactive compounds are electrochromic.
An electrochromic medium capable of producing a pre-selected color, comprising at least three electroactive compounds, two of which are of the same redox type and another which is of a complementary redox type, where one of said two electroactive compounds of the same redox type has a more accessible electrochemically activated redox state and is present at a concentration of less than 28 mol percent of the total electroactive compounds of the same redox type, and where two of the at least three electroactive compounds are electrochromic.
An electrochromic medium capable of producing a pre-selected color, comprising at least three electroactive compounds, two of which are of the same redox type and another which is of a complementary redox type, where one of said two electroactive compounds of the same redox type has a more easily accessible electrochemically activated redox state and contributes to the absorption spectrum of the electrochemically activated state of the medium to a greater extent expected based solely on its abundance in the medium.
Dependencies are inferred from the claim text.