26.3: Multicolor Pixel Patterning of Light‐Emitting Polymers by Ink‐Jet Printing

Abstract

Abstract In order to realize a multicolor display, we tried to pattern three different colors to make pixels by using ink‐jet technology. Light emitting polymer, poly( p ‐phenylene vinylene) (PPV), was successfully formulated into inks for ink‐jet printing. Those inks showed a good ink‐jetting behavior and became a good light emitting film. By combining the ink‐jet printing with the self‐patterning ability of the substrate, in which the hydrophilic and hydrophobic region is alternately constructed, an ink droplet can be patterned into the narrow pixel gap of 10 μm with precision of 1 μm order. We developed stacked structures combining PPV with Polyfluorene. It was confirmed that energy conversion from the wider gap layer to the smaller one occurred. As a result, we demonstrated the three color electroluminescence from the small pixels. This is the first demonstration of the fine pixel patterning of the multicolor light emitting polymers by ink‐jet technology.