Patent ID: 7807070

Claim:
A formulation for depositing an electroluminescent material on a substrate according to an ink-jet technique, the formulation comprising the electroluminescent material to be deposited on the substrate dissolved in a solvent system comprising a first solvent component having a relatively high boiling point and which exhibits a relatively low solubility with respect to the material to be deposited, and a second solvent component having a relatively low boiling point and which exhibits a relatively high solubility with respect to the material to be deposited, wherein the difference in boiling point between the first and second solvent components is in the range of 30° C. to 250° C., and the solubility of the material to be deposited in the first solvent component is up to 0.5% weight per volume, and the solubility of the material to be deposited in the second solvent component is greater than 1.5% weight per volume.