US 7,115,216 B2 · Screen printable electroluminescent polymer ink

Abstract

The addition of a variety of additives to a soluble electroluminescent polymer in solution is used to improve the printability and performance of screen printed light-emitting polymer-based devices. Examples of such additives include transparent polymers, gel-retarders, high viscosity liquids, organic and inorganic salts, and oxide nanoparticles. The additives are used to control the viscosity of the electroluminescent polymer ink, to decrease the solvent evaporation rate, and to improve the ink consistency and working time. In addition, these additives can improve the charge injection and power efficiency of light emitting devices manufactured from the screen printable electroluminescent polymer ink.

Claims17

Dependent claims

A screen-printable light-emitting polymer-based ink, comprising:

a soluble electroluminescent organic material;
a first additive, the first additive being an organic solvent having a boiling point between about 120 and 200 degrees Celsius;
and
a second additive, the second additive being a viscosity enhancer added to maintain a viscosity of the ink above about 50 centipoises, wherein the viscosity enhancer is a gel-retarder.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

10/327,628Filed 20 Dec 2002 · us provisional application

Priority

20 Dec 2001

Published

US 2003/0151700 A114 Aug 2003

Granted

3 Oct 2006

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

H10K 85/114
Comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene: poly-phenylenevinylene;…
C09D 11/50
Inks: sympathetic, colour changing or similar inks
H10K 71/13
Using liquid deposition, e.g. spin coating: using printing techniques, e.g. ink-jet printing or screen printing
H10K 71/15
Using liquid deposition, e.g. spin coating: characterised by the solvent used

Screen printable electroluminescent polymer ink

Life of this patent

Screen printable electroluminescent polymer ink

Life of this patent

Abstract

Claims17