Patent ID: 7700148

Claim:
A method of forming an electroluminescent device comprising: providing a substrate comprising a first electrode for injecting charge carriers of a first type; forming an electroluminescent layer having a surface by depositing onto the substrate a composition comprising a host material, a light-emitting dopant monomer of formula (I) and a second polymerisable group Y for copolymerization with X, one of X and Y being an optionally substituted thiol and the other is a group comprising a reactive unsaturated carbon-carbon bond: A-C—(X) n (I) wherein X represents a polymerisable group; A represents a light-emitting group; C represents a bond or a spacer group; and n is 1; rendering at least some of the electroluminescent layer insoluble in a solvent by polymerising the monomer of formula (I); exposing the electroluminescent layer to the solvent; and depositing a second electrode capable of injecting charge carriers of a second type over the electroluminescent layer.