Green electrochromic (EC) material and device
First Claim
1. An electrochromic device switchable between a first substantially transparent state and a second state in which the electrochromic device exhibits a saturated green color, comprising:
- (a) a transparent electrode;
(b) an electrochromic organic material which in a first state is generally transparent and in a second state exhibits a saturated green color, wherein the electrochromic organic material is based on 2,3-dibenzyl-5,7-di(thien-2-yl)thieno[3,4-b]pyrazine; and
(c) an electrolyte.
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Abstract
Three green EC materials based on thiophene, and a green EC material based on pyrazine are disclosed. A first thiophene derivative (2,3-Di-thiophen-2-yl-thieno[3,4-b]pyrazine), which was previously investigated as a nonlinear optical material, is here disclosed for its use as an EC material, and for its incorporation into an EC device. Synthesis of two new thiophene derivatives (2,5-di(thien-2-yl)-3,4-di(2,2,2-trifluoro-ethoxy)-thiophene and 2,5-(2,3-dihydro-thieno[3,4-b][1,4]dioxin-5-yl)-3,4-di(2,2,2-trifluoro-ethoxy)-thiophene), and a new pyrazine derivative (2,3-dibenzyl-5,7-di(thien-2-yl)thieno[3,4-b]pyrazine) are also disclosed, since these materials are all able to selectively change to a green color state, and can be polymerized to achieve a green EC polymer.
40 Citations
9 Claims
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1. An electrochromic device switchable between a first substantially transparent state and a second state in which the electrochromic device exhibits a saturated green color, comprising:
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(a) a transparent electrode; (b) an electrochromic organic material which in a first state is generally transparent and in a second state exhibits a saturated green color, wherein the electrochromic organic material is based on 2,3-dibenzyl-5,7-di(thien-2-yl)thieno[3,4-b]pyrazine; and (c) an electrolyte. - View Dependent Claims (2)
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3. An electrochromic device comprising:
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(a) a transparent electrode; (b) an electrochromic organic material which in a first state is generally transparent and in a second state exhibits a saturated green color, wherein the electrochromic organic material comprises 2,3-Di-thiophen-2-yl-thieno[3,4-b]pyrazine; and (c) an electrolyte. - View Dependent Claims (4, 5, 6, 7)
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8. An electrochromic device comprising:
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(a) a transparent electrode; (b) an electrochromic organic material which in a first state is not green and in a second state exhibits a green color, the electrochromic organic material exhibiting a single absorbance band, the electrochromic organic material being based on 2,5-di(thien-2-yl)-3,4-di(2,2,2-trifluoro-ethoxy)-thiophene; and (c) an electrolyte.
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9. An electrochromic device comprising:
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(a) a transparent electrode; (b) an electrochromic organic material which in a first state is not green and in a second state exhibits a green color, the electrochromic organic material exhibiting a single absorbance band, the electrochromic organic material being based on 2,5-(2,3-dihydro-thieno[3,4-b][1,4]dioxin-5-yl)-3,4-di(2,2,2-trifluoro-ethoxy)-thiophene; and (c) an electrolyte.
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Specification