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AssigneeCambridge Display Technology Limited
InventorsAndrew Holmes, Donal D. Bradley, Richard H. Friend, Arno Kraft, Paul Burn, Adam Brown
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A semiconductive conjugated copolymer comprises at least two chemically different monomer units which, when existing in their individual homopolymer forms, have different semiconductor bandgaps. The proportion of said at least two chemically different monomer units in the copolymer is selected to control the semiconductor bandgap of the copolymer so as to control the optical properties of the copolymer. The copolymer is formed in a manner enabling it to be laid down as a film without substantially affecting the luminescent characteristics of the copolymer and is stable at operational temperature. The semiconductor bandgap may be spatially modulated so as to increase the quantum efficiency of the copolymer when excited to luminesce, to select the wavelength of radiation omitted during luminescence or to select the refractive index of the copolymer.
A semiconductive conjugated film forming copolymer comprising:
A conjugated poly(arylene vinylene) film forming copolymer, comprising a poly(arylene vinylene) copolymer having a proportion of the vinylic groups of the copolymer saturated by inclusion of a modifier group substantially stable to elimination during formation of the film, wherein the proportion of saturated vinylic groups is effective to spatially modulate a semiconductor bandgap of the copolymer so as to modulate the optical properties of the copolymer, said copolymer being capable of forming a film without substantially affecting the luminescent characteristic of the copolymer said copolymer being stable at a temperature of about 0.degree.-150.degree. C.
A copolymer as claimed in 15, wherein at least one of the arylene vinylene units is substituted with a solubilizing group on the arylene ring so as to render the copolymer soluble in organic or aqueous solvents.
Dependencies are inferred from the claim text.