Semiconductive copolymers for use in luminescent devices
First Claim
1. An optical service which comprises a substrate and at least one semiconductive conjugated copolymer layer supported by the substrate, wherein the copolymer comprises an amount of poly(p-phenylene vinylene) in the range of about 90-95% and an amount of poly(2,5-dimethyl-phenylene vinylene) in the range of about 5-10%.
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Accused Products
Abstract
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 emitted during luminescence or to select the refractive index of the copolymer.
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Citations
48 Claims
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1. An optical service which comprises a substrate and at least one semiconductive conjugated copolymer layer supported by the substrate, wherein the copolymer comprises an amount of poly(p-phenylene vinylene) in the range of about 90-95% and an amount of poly(2,5-dimethyl-phenylene vinylene) in the range of about 5-10%.
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2. An optical service which comprises a substrate and at least one semiconductive conjugated copolymer layer supported by the substrate, wherein the copolymer comprises a copolymer of poly(p-phenylene vinylene) and poly(p-phenylene 1-methoxy-1,2 ethanediyl) comprising at least 20% poly(p-phenylene vinylene).
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3. An optical device which comprises a substrate and at least one semiconductive conjugated copolymer layer supported by the substrate, wherein the copolymer comprises an amount of poly(p-phenylene vinylene) in the range of about 90-95% and an amount of poly(2-methoxy-5-(2'"'"'-methylpentyloxy)-p-phenylene vinylene in the range of about 5-10%.
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4. An optical device which comprises a substrate and at least one semiconductive conjugated copolymer layer supported by the substrate, wherein the copolymer comprises an amount of poly(p-phenylene vinylene) in the range of about 90-95% and an amount of poly(2-methoxy-5-(2'"'"'-ethylhexyloxy)-p-phenylene vinylene in the range of about 5-10%.
- 5. An optical device which comprises a substrate and at least one semiconductive conjugated copolymer layer supported by the substrate, wherein the copolymer comprises a poly(p-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 layer, 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 stable at a temperature of about 0°
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48. An optical device which comprises a substrate and at least one semiconductive conjugated polymer layer supported by the substrate, wherein the polymer comprises a poly(arylene vinylene) polymer having a proportion of the vinylic groups of the polymer saturated by inclusion of a modifier group substantially stable to elimination during formation of the layer, wherein the proportion of saturated vinylic groups is effective to spatially modulate a semiconductor bandgap of the polymer so as to modulate the optical properties of the polymer, said polymer being stable at a temperature of about 0°
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C., which polymer is formed by heating substantially in the absence of oxygen a poly(arylene-1,2-ethanediyl) precursor polymer having a proportion of the ethane groups substituted with a modifier group substituent and a further proportion of the ethane groups substituted with a leaving group substituent, wherein the precursor polymer is heated until substantially all of the leaving group substituents are eliminated without substantial elimination of the modifier group substituents to form the conjugated poly(arylene vinylene) polymer.
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Specification