MULTI-LAYER LIGAND EXCHANGE THERMOCHROMIC SYSTEMS
First Claim
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 Hε
L ligand capable of forming a Hε
MLC with the transition metal ion, and at least one Lε
L ligand capable of forming a Lε
MLC 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 Hε
MLC in the first layer is greater than the light energy absorbance of the Hε
MLC in the second layer for a portion of the visible and/or NIR range.
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Abstract
Ligand exchange of thermochromic, LETC, systems exhibiting a reversible change in absorbance of electromagnetic radiation as the temperature of the system is reversibly changed are described. The described LETC systems include one or more than one transition metal ion, which experiences thermally induced changes in the nature of the complexation or coordination around the transition metal ion(s) and, thereby, the system changes its ability to absorb electromagnetic radiation as the temperature changes. In accordance with one aspect of the present invention, a thermochromic device is disclosed comprising at least two thermochromic layers when each thermochromic layer includes 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 an LεMLC with the transition metal ion. In accordance with yet another aspect of the present invention, the thermochromic device further includes a separator between the first and second thermochromic layers to prevent intermixing of the contents of the layers.
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Citations
19 Claims
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1. A thermochromic device that comprises:
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first and second thermochromic layers, wherein each thermochromic layer respectively contains a polymer, at least one transition metal ion, at least one Hε
L ligand capable of forming a Hε
MLC with the transition metal ion, and at least one Lε
L ligand capable of forming a Lε
MLC 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 Hε
MLC in the first layer is greater than the light energy absorbance of the Hε
MLC in the second layer for a portion of the visible and/or NIR range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification