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US 7,746,533 B2Granted
Electrochromic devices utilizing very low band gap conjugated counter electrodes: preparation and use
AssigneeUniversity of Connecticut
InventorsGregory A. Sotzing, Venkataramanan Seshadri
Life of this patent
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Abstract
Disclosed herein are electrochromic devices using a very low band-gap conjugated polymer having a band gap (Eg) of less than or equal to about 1.5 eV, and having little or no electrochromism in the visible region of the electromagnetic spectrum.
Claims35
An electrochromic device, comprising:
- a first layer comprising a first conjugated polymer, wherein the first conjugated polymer has a band gap of less than or equal to about 1.5 eV and an Lmax absorption peak of greater than or equal to about 750 nm in the neutral, oxidized, and reduced forms, and wherein the first layer functions as an ion-storage layer;
- a second layer comprising a second conjugated polymer, wherein the second conjugated polymer has a band gap of less than about 2.5 eV and wherein the second layer functions as an electrochromic in the visible region of the electromagnetic spectrum;
- an electrolyte layer disposed between and in contact with the first layer and the second layer;
- a first electrode in electrical communication with the first layer;
- and
- a second electrode in electrical communication with the second layer.
3 more elements
An electrochromic device, comprising:
- a first layer comprising a first conjugated polymer, wherein the first conjugated polymer has a band gap of less than or equal to about 1.5 eV and a Lmax absorption peak of greater than or equal to about 750 nm in the neutral, oxidized, and reduced forms, and wherein the first layer functions as an ion-storage layer;
- a second layer comprising an ion-chelating inorganic structure that reversibly binds to counter-ions;
- an electrolyte layer in contact with the first layer and the second layer;
- a first electrode in electrical communication with the first layer;
- and
- a second electrode in electrical communication with the second layer.
3 more elements
An electrochromic device, comprising:
- a substantially transparent outer layer;
- a first electrode located behind the transparent outer layer, wherein the first electrode comprises a reflective surface facing the outer layer and a means for allowing ions to pass through the first electrode;
- a first layer comprising a first conjugated polymer disposed between the reflective surface and the transparent outer layer and in electrical communication with the first electrode, wherein the first conjugated polymer is an electrochromic material;
- a first electrolyte layer in contact with the first layer and the first electrode;
- a second electrode located behind the transparent outer layer and behind the first electrode;
- a second layer comprising a second conjugated polymer, wherein the second conjugated polymer has a band gap of less than or equal to about 1.5 eV and an Lmax absorption peak of greater than or equal to about 750 nm in the neutral, oxidized, and reduced forms, wherein the second layer is disposed on and in electrical communication with the second electrode;
- and
- a second electrolyte layer disposed between the second layer and the first electrode.
5 more elements
Dependencies are inferred from the claim text.