Semiconductive copolymers for use in luminescent devices
First Claim
1. An optical device which comprises a substrate, and at least one semiconductive conjugated copolymer layer supported by the substrate, wherein the copolymer comprises at least two chemically different monomer units each having different semiconductor bandgaps in their individual homopolymer forms, and wherein the proportion in the copolymer of said at least two chemically different monomer units forms the copolymer with a semiconductor bandgap that is spatially modulated from the semiconductor bandgap of each homopolymer form so that the optical properties of the copolymer are modulated, said copolymer being stable at operational temperatures within the range of about 0°
- C. to 150°
C.
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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 omitted during luminescence or to select the refractive index of the copolymer.
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Citations
18 Claims
- 1. An optical device which comprises a substrate, and at least one semiconductive conjugated copolymer layer supported by the substrate, wherein the copolymer comprises at least two chemically different monomer units each having different semiconductor bandgaps in their individual homopolymer forms, and wherein the proportion in the copolymer of said at least two chemically different monomer units forms the copolymer with a semiconductor bandgap that is spatially modulated from the semiconductor bandgap of each homopolymer form so that the optical properties of the copolymer are modulated, said copolymer being stable at operational temperatures within the range of about 0°
Specification