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US 6,696,104 B2Granted
Light-transmissive substrate having a light-transmissive, low-ohmic coating
AssigneeKoninklijke Philips Electronics N.V.
InventorsHenricus X. Willems, Bauke H. Zwerver, Gerardus V. A. Aben, Johannes M. A. A. Compen
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Abstract
A substrate carrying a mixed organic conductive polymer coating, has a high index of refraction. On a substrate having SiO2 as a major component, the coating comprises two layers each having SiO2 as a major component. One of the layers comprises a conducting polymer, the other a material having a high index of refraction.
Claims5
A method of manufacturing a light-transmissive, low-ohmic coating on a substrate, characterized in that the coating is manufactured by
- providing the substrate with a porous layer comprising high index material having an index of refraction which is higher than the substrate,
- subsequently applying a coating solution of a monomer of which the polymer is conductive and an Fe(III) salt on the substrate, whereafter a treatment at an increased temperature is carried out, thereby forming a layer comprising a conductive polymer and an Fe(II) salt, after which the double layer is rinsed with an ethanolic solution which is capable of extracting Fe salts, thereby forming a first layer having an index of refraction which is higher than the index of refraction of the substrate and a second layer forming an electroconductive layer having an index of refraction which is lower than the index of refraction of the substrate.
Dependencies are inferred from the claim text.