Electrochromic composition and electrochromic device
An electrochromic composition including: a first oxidizable compound; a reducible compound; an electrolyte; and a solvent, wherein the first oxidizable compound is represented by the following formula: wherein X 1 , and X 2 are independently substituted or unsubstituted aliphatic hydrocarbon groups, or substituted or unsubstituted aromatic hydrocarbon groups, wherein the aromatic hydrocarbon groups include: wherein each R x is independently hydrogen, a C1-C16 alkyl group, a C1-C16 alkoxy group, a C1-C16 haloalkyl group, or halogen.
1. An electrochromic composition, comprising:
a first oxidizable compound;
a reducible compound;
an electrolyte; and
a solvent,
wherein the first oxidizable compound is represented by the following formula:
wherein X1, and X2 are independently substituted or unsubstituted aliphatic hydrocarbon groups, or substituted or unsubstituted aromatic hydrocarbon groups, wherein the aromatic hydrocarbon groups comprise:
wherein each Rx is independently hydrogen, a C1-C16 alkyl group, a C1-C16 alkoxy group, a C1-C16 haloalkyl group, or halogen.
2. The electrochromic composition according to claim 1 , wherein a concentration of the first oxidizable compound is between 0.01M and 0.5M.
3. The electrochromic composition according to claim 1 , wherein a concentration of the reducible compound is between 0.01M and 0.5M.
4. The electrochromic composition according to claim 1 , wherein the reducible compound is a viologen compound.
5. The electrochromic composition according to claim 1 , wherein the reducible compound is represented by the following formula:
wherein R1 is a C1-C16 alkyl group.
6. The electrochromic composition according to claim 1 , wherein a molar ratio of the first oxidizable compound to the reducible compound is 1:0.01 to 1:50.
7. The electrochromic composition according to claim 1 , wherein a concentration of the electrolyte is between 0.01M and 5M.
8. The electrochromic composition according to claim 1 , wherein the electrolyte comprises lithium salts, amine salts, tetraalkylammonium salts, or imidazolium salts.
9. The electrochromic composition according to claim 1 , further comprising a second reducible compound different from the first reducible compound.
10. The electrochromic composition as claimed in claim 1 , further comprising a UV absorber, a UV blocker, an IR absorber, an IR blocker, or a combination thereof.
11. An electrochromic device, comprising:
a pair of electrodes, comprising:
a first transparent substrate with a first transparent conductive layer on one of its surfaces; and
a second transparent substrate with a second transparent conductive layer on one of its surfaces, wherein the first transparent conductive layer and the second transparent conductive layer are disposed opposite to each other;
an isolating unit interposed between the first transparent conductive layer and the second transparent conductive layer such that a cell is formed between the first transparent substrate, the second transparent substrate and the isolating unit; and
an electrochromic compound filled into the cell, wherein the electrochromic compound is according to claim 1 .
12. The electrochromic device according to claim 11 , wherein a distance between the first transparent conductive layer and the second transparent conductive layer is between 1 μm and 300 μm.
13. The electrochromic device according to claim 11 , wherein the isolating unit comprises a gap filler and an adhesive.
14. The electrochromic device according to claim 13 , wherein the adhesive comprises a thermosetting adhesive, a photosetting adhesive, or a combination thereof.
15. The electrochromic device according to claim 13 , wherein the gap filler comprises plastic, glass beads, sand powder, or a combination thereof.