| US 7,525,717 B2 | ||
| Multi-layer ligand exchange thermochromic systems | ||
| Harlan J. Byker, West Olive, Mich. (US); Frederick A. Millett, Grand Haven, Mich. (US); Paul H. Ogburn, Jr., Hudsonville, Mich. (US); Douglas A. Vander Griend, Grand Rapids, Mich. (US); Brad S. Veldkamp, Zeeland, Mich. (US); and Derick D. Winkle, Holland, Mich. (US) | ||
| Assigned to Pleotint, L.L.C., West Olive, Mich. (US) | ||
| Filed on Sep. 04, 2007, as Appl. No. 11/849,659. | ||
| Claims priority of provisional application 60/841827, filed on Sep. 01, 2006. | ||
| Prior Publication US 2008/0100903 A1, May 01, 2008 | ||
| Int. Cl. G02F 1/01 (2006.01); G02F 1/00 (2006.01); G09G 3/34 (2006.01); C07F 15/04 (2006.01) | ||
| U.S. Cl. 359—288 [359/321; 345/106; 546/10] | 19 Claims |
| 1. A thermochromic device that comprises:
first and second thermochromic layers, wherein each thermochromic layer respectively contains a polymer, at least one transition
metal ion, at least one HεL ligand capable of forming a HεMLC with the transition metal ion, and at least one LεL ligand capable
of forming a LεMLC with the transition metal ion;
wherein each layer exhibits a reversible net increase in light energy absorbance in the visible and/or NIR range as the temperature
of the layer increases, and at elevated temperatures, the light energy absorbance of the HεMLC in the first layer is greater
than the light energy absorbance of the HεMLC in the second layer for a portion of the visible and/or NIR range.
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