ELECTROCHROMIC DEVICES
First Claim
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1. A device comprising:
- (a) a first substrate with a conductive surface;
(b) a second substrate with a conductive surface; and
(c) a composition comprising;
(i) 10-60 wt % of a polymer selected from the group of amorphous, film-forming polymers with Tg less than 100°
C.;
(ii) 45-70 wt % of a plasticizer, wherein the plasticizer is soluble in the polymer to at least 45 wt %;
(iii) 1-30 wt % of an electrochromophore, wherein the electrochromophore is soluble in the plasticizer to at least 10 wt %;
(iv) 0.1-10 wt % of an electron mediator selected from the group consisting of ferrocene, butyl ferrocene, ferrocene carboxylic acid, phenazine and its derivatives, carbazole and its derivatives, phenothiazine and its derivatives, and phenanthroline and its derivatives; and
(v) 0.1-10 wt % of a salt selected from the group consisting of lithium chloride, tetrabutylammonium bromide, lithium bis(trifluoromethanesulfonyl)imide, lithium triflate, and lithium hexafluorophosphate,wherein the melting point of the plasticizer is not above about 0°
C., the boiling point of the plasticizer is above about 190°
C. at a pressure of 1 atmosphere, and the solubility in the plasticizer of the electrochromophore, the electron mediator and the salt are each at least 0.05 mg per mg of plasticizer,wherein the composition is in contact with the conductive surfaces of the first and second substrates, wherein at least one substrate and associated conductive surface is transparent.
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Abstract
Disclosed are electrochromic devices incorporating electrochromic materials containing a film-forming polymer with a Tg less than 100° C.; a plasticizer; an electrochromophore; an electron mediator; and a salt. Such electrochromic devices can provide light-filtering, color-modulation, or reflectance-modulation in variable transmittance windows, variable-reflectance mirrors and other dynamic glazing applications.
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Citations
11 Claims
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1. A device comprising:
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(a) a first substrate with a conductive surface; (b) a second substrate with a conductive surface; and (c) a composition comprising; (i) 10-60 wt % of a polymer selected from the group of amorphous, film-forming polymers with Tg less than 100°
C.;(ii) 45-70 wt % of a plasticizer, wherein the plasticizer is soluble in the polymer to at least 45 wt %; (iii) 1-30 wt % of an electrochromophore, wherein the electrochromophore is soluble in the plasticizer to at least 10 wt %; (iv) 0.1-10 wt % of an electron mediator selected from the group consisting of ferrocene, butyl ferrocene, ferrocene carboxylic acid, phenazine and its derivatives, carbazole and its derivatives, phenothiazine and its derivatives, and phenanthroline and its derivatives; and (v) 0.1-10 wt % of a salt selected from the group consisting of lithium chloride, tetrabutylammonium bromide, lithium bis(trifluoromethanesulfonyl)imide, lithium triflate, and lithium hexafluorophosphate, wherein the melting point of the plasticizer is not above about 0°
C., the boiling point of the plasticizer is above about 190°
C. at a pressure of 1 atmosphere, and the solubility in the plasticizer of the electrochromophore, the electron mediator and the salt are each at least 0.05 mg per mg of plasticizer,wherein the composition is in contact with the conductive surfaces of the first and second substrates, wherein at least one substrate and associated conductive surface is transparent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification