Color variable bipolar/AC light-emitting devices
First Claim
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1. A color-variable electroluminescent device comprising:
- (a) a polymeric layer adapted to act as a light emitting layer, said polymeric layer comprising a blend of at least two emissive polymers having different emissive and charge transport properties such that said blended polymeric layer is capable of conducting current in opposing directions; and
(b) two electrodes disposed respectively on either side of said polymeric layer, said polymeric layer being in electrical contact with said electrodes so as to be capable of producing a color variable light emission upon a current being passed in different directions through said polymeric layer, said color of said light emission dependent upon said direction of said current.
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Abstract
Color-variable light-emitting devices which are capable of generating two independent colors, even at room temperature. The devices comprise a layer of at least one active electroluminescent polymer. This electroluminescent polymer may be accompanied by one or two redox-mediating polymer layers. The redox polymer layer(s) modify the charge injection and transport properties such that the device may be operated under both forward and reverse bias.
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Citations
28 Claims
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1. A color-variable electroluminescent device comprising:
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(a) a polymeric layer adapted to act as a light emitting layer, said polymeric layer comprising a blend of at least two emissive polymers having different emissive and charge transport properties such that said blended polymeric layer is capable of conducting current in opposing directions; and
(b) two electrodes disposed respectively on either side of said polymeric layer, said polymeric layer being in electrical contact with said electrodes so as to be capable of producing a color variable light emission upon a current being passed in different directions through said polymeric layer, said color of said light emission dependent upon said direction of said current. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A color-variable electroluminescent device comprising:
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(a) a first non-emissive polymeric layer;
(b) a second non-emissive polymeric layer;
(c) an intermediate polymeric layer adapted to act as a light emitting layer and disposed between said first non-emissive polymeric layer and said second non-emissive polymeric layer and capable of conducting current in opposing directions, at least one of said non-emissive polymer layers adapted to modify the emission properties of said intermediate polymeric layer such that an interface between said light emitting layer and said at least one non-emissive polymer layer is adapted to emit light of a different color than said light emitting layer; and
(d) two electrodes in electrical contact respectively with said first non-emissive polymeric layer and said second non-emissive polymeric layer, said intermediate polymeric layer being in electrical contact with said first non-emissive polymeric layer and said second non-emissive polymeric layer so as to be capable of producing a color-variable light emission upon a current being passed in different directions through said intermediate polymeric layer, said color of said light emission dependent upon said direction of said current. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A color-variable electroluminescent device comprising:
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(a) a non-emissive polymeric layer;
(b) two electrodes, a first electrode in electrical contact with said non-emissive polymeric layer, and a second electrode; and
(c) an intermediate polymeric layer comprising a blend of at least two emissive polymers having different emissive and charge transport properties, said intermediate polymer layer adapted to act as a light emitting layer and disposed between said non-emissive polymeric layer and said second electrode and capable of conducting current in opposing directions, said intermediate polymeric layer being in electrical contact with said non-emissive polymeric layer so as to be capable of producing a color-variable light emission upon a current being passed in different directions through said intermediate polymeric layer, said color of said light emission dependent upon said direction of said current. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification