Electrochemichromic solutions, processes for preparing and using the same, and devices manufactured with the same

• US 5,424,865 A
• Filed: 01/17/1993
• Issued: 06/13/1995
• Est. Priority Date: 09/06/1991
• Status: Expired due to Term

• Current Assignee: Donnelly Corporation (Magna International Incorporated)
• Original Assignee: Donnelly Corporation (Magna International Incorporated)
• Inventors: Lynam, Niall R.
• Primary Examiner(s): Epps, Georgia Y.
• Assistant Examiner(s): Robbins, Thomas
• Application Number:
  US08/061,742
• Time in Patent Office: 877 Days
• Field of Search: 359/270, 359/272, 359/265, 252/586, 252/583
• US Class Current: 359/270
• CPC Class Codes: C09K 9/02 Organic tenebrescent materials
• CPC Class Codes: E06B 2009/2464 featuring transparency control by applying voltage, e.g. LCD, electrochromic panels
• CPC Class Codes: E06B 9/24 Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blindsoperating, guiding or securing devices or arrangements for roll-type closures E06B9/56; free-hanging flexible screens A47H23/00
• CPC Class Codes: G02F 1/1503 caused by oxidation-reduction reactions in organic liquid solutions, e.g. viologen solutions
• CPC Class Codes: G02F 2001/1502 complementary cell
• CPC Class Codes: G02F 2001/15145 the electrochromic layer comprises a mixture of anodic and cathodic compounds

Abstract

The present invention relates to electrochromic solutions and devices manufactured therefrom. More precisely, the invention relates to electrochemichromic solutions, and those devices manufactured with the same, that demonstrate superior responsiveness to those solutions known heretofore when an applied potential is introduced thereto. That is, the responsiveness observed in terms of solution coloring is of a greater rapidity, intensity and uniformity than those electrochemichromic solutions of the prior art. Preparation of these solutions involve the novel process of pre-treating at least one of the electrochemichromic compounds with a redox agent prior to placing it in contact with the other electrochemichromic compound. Moreover, the present invention relates to methods of preparing such novel solutions and processes for using these solutions to provide devices that exhibit and benefit from the aforementioned superior characteristics.

Claims

1. An electrochemichromic device capable for use as a vehicular glazing which may be selected from the group consisting of windows, sun roofs, sun visors and shade bands, said electrochemichromic device comprising:

(a) a first substantially transparent substrate coated with at least a substantially transparent conductive coating on its interior face having a sheet resistance in the range of from about 1 to about 100 ohms per square;

(b) a second substantially transparent substrate coated with at least a substantially transparent conductive coating on its interior face having a sheet resistance in the range of from about 1 to about 100 ohms per square, said second substrate positioned in substantially parallel spaced-apart relationship with said first substrate and being laterally displaced therefrom;

(c) sealing means positioned toward the peripheral edge of each of said first substrate and said second substrate and sealingly forming a cell cavity therebetween;

(d) an electrochemichromic solution capable of color change when an applied potential is introduced thereto having been dispensed into and confined within said cell cavity, said electrochemichromic solution comprising;

(i) at least one anodic compound;

(ii) at least one cathodic compound; and

(iii) a solvent; and

(e) a means for introducing an applied potential to said electrochemichromic solution to controllably cause a variation in the amount of light transmitted through said device, wherein at least one of said first substrate and said second substrate is constructed from float glass and increases the amount of reflected color inhibited and light transmitted therethrough, wherein said conductive coating of said at least one of said first substrate and said second substrate is composed of a layer of fluorine-doped tin oxide, wherein the at least one substrate constructed from float glass is coated with a multilayer structure that increases the amount of reflected color inhibited, said multilayer structure comprising said layer of fluorine-doped tin oxide, and wherein said layer of fluorine-doped tin oxide is undercoated with an anti-iridescence means.

2. The electrochemichromic device according to claim 1, wherein each of said first substrate and said second substrate is coated with a multilayer structure that increases the amount of reflected color inhibited, said multilayer structure comprising a layer of fluorine-doped tin oxide, wherein said layer of fluorine-doped tin oxide is undercoated with an anti-iridescence means.

3. The electrochemichromic device according to claim 1 or 2, wherein said anti-iridescence means comprises additional thin film layers which undercoat said layer of fluorine-doped tin oxide.

4. The electrochemichromic device according to claim 1 or 2, wherein said anti-iridescence means comprises (i) a layer of silica-silicone and (ii) a layer of tin oxide, wherein said silica-silicone layer is disposed between said layer of fluorine-doped tin oxide and said layer of tin oxide.

5. The electrochemichromic device according to claim 1, wherein the at least one substrate constructed from float glass is coated with a multilayer structure manufactured through on-line chemical vapor deposition.

6. The electrochemichromic device according to claim 2, wherein each of said first substrate and said second substrate is coated with a multilayer structure manufactured through on-line chemical vapor deposition.

7. The electrochemichromic device according to claim 5, wherein the at least one substrate constructed from float glass is coated with a multilayer structure manufactured through on-line chemical vapor deposition and has a daylight transmittance of about 77%.

8. The electrochemichromic device according to claim 6, wherein the daylight transmittance of each of said first substrate and said second substrate is about 77%.

9. The electrochemichromic device according to claim 7 or 8, wherein the daylight transmittance is in the range of from about 77% to about 87%.

10. The electrochemichromic device according to claim 5, wherein the at least one substrate constructed from float glass is coated with a multilayer structure manufactured through on-line chemical vapor deposition and has a solar transmittance of about 64%.

11. The electrochemichromic device according to claim 6, wherein the solar transmittance of each of said first substrate and said second substrate is about 64%.

12. The electrochemichromic device according to claim 10 or 11, wherein the solar transmittance is in the range of from about 64% to about 80%.

13. The electrochemichromic device according to claim 5, wherein the at least one substrate constructed from float glass is coated with a multilayer structure manufactured through on-line chemical vapor deposition and has an infrared reflectance at a wavelength of about 10 μ

m in the range of from about 30% to about 87%.

14. The electrochemichromic device according to claim 6, wherein the infrared reflectance at a wavelength of about 10 μ

m of each of said first substrate and said second substrate is in the range of from about 30% to about 87%.

15. An electrochemichromic mirror selected from the group consisting of automotive rearview interior mirrors, automotive rearview exterior mirrors and large area truck mirrors and having a range of reflectance from greater than about 70% to less than about 10%, said electrochemichromic mirror comprising:

(a) a first substantially transparent substrate coated with at least a substantially transparent conductive coating on its interior face having a sheet resistance in the range of from about 1 to about 100 ohms per square;

(b) a second substantially transparent substrate coated with at least a substantially transparent conductive coating on its interior face having a sheet resistance in the range of from about 1 to about 100 ohms per square, said second conductive coated substrate positioned in substantially parallel spaced-apart relationship with said first substrate and being laterally displaced therefrom;

(c) sealing means positioned toward the peripheral edge of each of said first substrate and said second substrate and sealingly forming a cell cavity therebetween;

(d) a reflective coating on a face of either one of said first substrate or said second substrate;

(e) an electrochemichromic solution capable of color change when an applied potential is introduced thereto having been dispensed into and confined within said cell cavity, said electrochemichromic solution comprising;

(i) at least one anodic compound;

(ii) at least one cathodic compound; and

(iii) a solvent; and

(f) a means for introducing an applied potential to said electrochemichromic solution to controllably cause a variation in the amount of light reflected from said mirror, wherein at least one of said first substrate and said second substrate is constructed from float glass and increases the amount of reflected color inhibited and light transmitted therethrough, wherein said conductive coating of said at least one of said first substrate and said second substrate is composed of fluorine-doped tin oxide, wherein the at least one substrate constructed from float glass is coated with a multilayer structure that increases the amount of reflected color inhibited, said multilayer structure comprising said layer of fluorine-doped tin oxide, and wherein said layer of fluorine-doped tin oxide is undercoated with an anti-iridescence means.

16. The electrochemichromic mirror according to claim 15, wherein each of said first substrate and said second substrate is coated with a multilayer structure that increases the amount of reflected color inhibited, said multilayer structure comprising a layer of fluorine-doped tin oxide, wherein said layer of fluorine-doped tin oxide is undercoated with an anti-iridescence means.

17. The electrochemichromic mirror according to claim 15 or 16, wherein said anti-iridescence means comprises additional thin film layers which undercoat said layer of fluoride-doped tin oxide.

18. The electrochemichromic mirror according to claim 15 or 16, wherein said anti-iridescence means comprises (i) a layer of silica-silicone and (ii) a layer of tin oxide, wherein said silica-silicone layer is disposed between said layer of fluorine-doped tin oxide and said layer of tin oxide.

19. The electrochemichromic mirror according to claim 15, wherein the at least one substrate constructed from float glass is coated with a multilayer structure manufactured through on-line chemical vapor deposition.

20. The electrochemichromic mirror according to claim 16, wherein each of said first substrate and said second substrate is coated with a multilayer structure manufactured through on-line chemical vapor deposition.

21. The electrochemichromic mirror according to claim 19, wherein the at least one substrate constructed from float glass is coated with a multilayer structure manufactured through on-line chemical vapor deposition and has a daylight transmittance of about 77%.

22. The electrochemichromic mirror according to claim 20, wherein the daylight transmittance of each of said first substrate and said second substrate is about 77%.

23. The electrochemichromic mirror according to claims 21 or 22, wherein the daylight transmittance is in the range of from about 77% to about 87%.

24. The electrochemichromic mirror according to claim 19, wherein the at least one substrate constructed from float glass is coated with a multilayer structure manufactured through on-line chemical vapor deposition and has a solar transmittance of about 64%.

25. The electrochemichromic mirror according to claim 20, wherein the solar transmittance of each of said first substrate and said second substrate is about 64%.

26. The electrochemichromic mirror according to claim 24 or 25, wherein the solar transmittance is in the range of from about 64% to about 80%.

27. The electrochemichromic mirror according to claim 19, wherein the at least one substrate constructed from float glass is coated with a multilayer structure manufactured through on-line chemical vapor deposition and has an infrared reflectance at a wavelength of about 10 μ

m in the range of from about 30% to about 87%.

28. The electrochemichromic mirror according to claim 20, wherein the infrared reflectance at a wavelength of about 10 μ

m of each of said first substrate and said second substrate is in the range of from about 30% to about 87%.