Green electrochromic (EC) material and device
US7298541B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 2005 |
| Grant date | Nov 20, 2007 |
| Priority date | — |
| Expiry date | Nov 17, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2211/1092
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.