Patent ID: 7525717
Filing Date: 2009-04-28
Classification: B32B,C09K,G02F

Abstract:
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.