Electrochromic material with improved lifetime
First Claim
1. An electrochromic material, which comprises a viologen compound having a regulator group linked to 4,4′
- -bipyridinium having three oxidation states, bipm2+, bipm+ and bipmo, as represented by the following scheme, the regulator group being capable of increasing Δ
E that is a potential difference between E1 and E2;
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Accused Products
Abstract
Disclosed are viologen derivatives as an electrochromic material having improved stability and lifetime, a metal oxide electrode including the same, and an electrochromic device using the viologen derivative as an electrochromic material. The viologen derivative includes a suitable regulator group capable of increasing ΔE that is a potential difference between E1 (potential at the first redox reaction) and E2 (potential at the second redox reaction). When ΔE increases, the mole fraction of viologen molecules present in the second reduction state decreases. Therefore, it is possible to lower the mole fraction of viologen molecules present in an irreversibly reduced state at an applied potential, thereby increasing the lifetime of an electrochromic material and an electrochromic device.
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Citations
16 Claims
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1. An electrochromic material, which comprises a viologen compound having a regulator group linked to 4,4′
- -bipyridinium having three oxidation states, bipm2+, bipm+ and bipmo, as represented by the following scheme, the regulator group being capable of increasing Δ
E that is a potential difference between E1 and E2;
- View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 14, 15, 16)
- -bipyridinium having three oxidation states, bipm2+, bipm+ and bipmo, as represented by the following scheme, the regulator group being capable of increasing Δ
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2. An electrochromic material, which comprises a group viologen compound having a cationic regulator group linked to 4,4′
- -bipyridinium.
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3. An electrochromic material, which comprises a viologen compound having an additional redox-coupled functional regulator group linked to 4,4′
- -bipyridinium, the regulator group being capable of forming a redox couple electrically with a bipyridinium ring.
- 12. A compound represented by the following formula 1:
Specification