Electrochromic polymers and polymer electrochromic devices
First Claim
1. A composition of matter, comprising:
- an anodically coloring polymer providing a band gap (Eg)>
3.0 eV in its neutral state, being fully conjugated in its neutral state and having an oxidation potential less than 0.5 V versus a saturated calomel electrode (SCE).
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Abstract
The subject invention pertains to electrochromic polymers and polymer electrochromic devices. In a specific embodiment, two complementary polymers can be matched and incorporated into dual polymer electrochromic devices. The anodically coloring polymers in accordance with the subject invention can allow control over the color, brightness, and environmental stability of an electrochromic window. In addition, high device contrast ratios, high transmittance changes, and high luminance changes can be achieved, along with half-second switching times for full color change. Also provided are electrochromic devices such as advertising signage, video monitors, stadium scoreboards, computers, announcement boards, warning systems for cell phones, warning/information systems for automobiles, greeting cards, electrochromic windows, billboards, electronic books, and electrical wiring. The subject invention also provides for the use of complementary electrochromic polymers in the manufacture of electrochromic devices. In some embodiments, the devices of the invention can be prepared using metal vapor deposition or line patterning.
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Citations
25 Claims
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1. A composition of matter, comprising:
an anodically coloring polymer providing a band gap (Eg)>
3.0 eV in its neutral state, being fully conjugated in its neutral state and having an oxidation potential less than 0.5 V versus a saturated calomel electrode (SCE).- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An electrochromic device, comprising:
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a first electrode;
a second electrode;
an anodically coloring polymer providing a band gap (Eg)>
3.0 eV in its neutral state, being fully conjugated in its neutral state and having an oxidation potential less than 0.5 V versus a saturated calomel electrode (SCE) in electrical contact with said second electrode and a reducible species in contact with said first electrode, andan electrolyte interposed between said anodically coloring polymer and said first electrode, wherein said device is optically clear when a positive voltage is applied to said first electrode with respect to the second electrode, and colored upon application of a negative voltage to said first electrode with respect to said second electrode. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification