A method of forming an electroluminescent device comprising the steps of:
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 and a light-emitting dopant monomer of formula (I):
A-C--(X).sub.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 an integer; 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.