US Patent 7317047 - Nanoparticle doped conductive polymer for OLEDs

http://www.freepatentsonline.com/7317047.html

This patent from du Pont teaches the use of nanoparticles to reduce the conductivity of buffer layers used in electroluminescent devices to help prevent electrical crosstalk. Claim 1 reads:

1. A composition comprising an aqueous dispersion of an electrically conductive organic polymer doped with a polymeric acid and a plurality of nanoparticles wherein said electrically conductive organic polymer is selected from combinations of any two or more of polyanilines, polythiophenes and polypyrroles.