An organic polymer having a plurality of regions along the length of the
polymer backbone and comprising two or more of the following a first
region for transporting negative charge carriers and having a first
bandgap defined by a first LUMO level and a first HOMO level; and a second
region for transporting positive charge carriers and having a second
bandgap defined by a second LUMO level and a second HOMO level; and a
third region for accepting and combining positive and negative charge
carriers to generate light and having a third bandgap defined by a third
LUMO level and a third HOMO level, wherein each region comprises one or
more monomers and the quantity arrangement of the monomers in the organic
polymer is selected so that the first, second and third bandgaps are
distinct from one another in the polymer.
