Organic light active devices with particulated light active material in a carrier matrix
First Claim
1. A light active device comprising:
- a semiconductor particulate dispersed within a conductive carrier material;
a first contact layer which is selected so that on application of an electric field to the first contact layer charge carriers of a first type are injected into the semiconductor particulate through the conductive carrier material; and
a second contact layer which is selected so that on application of an electric field to the second contact layer charge carriers of a second type are injected into the semiconductor particulate through the conductive carrier material.
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Abstract
A light active device includes a semiconductor particulate dispersed within a carrier material. A first contact layer is provided so that on application of an electric field charge carriers having a polarity are injected into the semiconductor particulate through the conductive carrier material. A second contact layer is provided so that on application of the electric field to the second contact layer charge carriers having an opposite polarity are injected into the semiconductor particulate through the conductive carrier material. The semiconductor particulate comprises at least one of an organic and an inorganic semiconductor. The semiconductor particulate may comprise an organic light active particulate that includes at least one conjugated polymer. When an electric field is applied between the first and second contact layers to the semiconductor particulate through the conductive carrier material, the second contact layer becomes positive relative to the first contact layer and charge carriers of opposite polarity are injected into the semiconductor particulate. The opposite polarity charge carriers combine to form in the conjugated polymer charge carrier pairs which decay radiatively so that radiation is emitted from the conjugated polymer. In this case, the inventive light active device acts as a light emitting diode.
47 Citations
37 Claims
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1. A light active device comprising:
- a semiconductor particulate dispersed within a conductive carrier material;
a first contact layer which is selected so that on application of an electric field to the first contact layer charge carriers of a first type are injected into the semiconductor particulate through the conductive carrier material; and
a second contact layer which is selected so that on application of an electric field to the second contact layer charge carriers of a second type are injected into the semiconductor particulate through the conductive carrier material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- a semiconductor particulate dispersed within a conductive carrier material;
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10. A voltage controlled light active device for emitting two or more colors of light, comprising:
- a first electrode;
a second electrode disposed adjacent to the first electrode and defining a gap therebetween;
a light active layer comprised of a mixture of a light active particulate and a conductive carrier material, said mixture being disposed within said gap, said light active particulate comprised of first emitting particles including a first electroluminescent conjugated polymer, the first emitting particles emitting a number of photons of a first color in response to a first turn-on voltage applied to the electrodes and emitting a different number of photons of the first color in response to other turn-on voltages, said light active particulate further comprised of second emitting particles, the second emitting particles emitting a number of photons of a second color in response to a second turn-on voltage and a different number of photons of the second color in response to other turn-on voltages. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
- a first electrode;
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20. An organic light active display device, comprising:
- a substrate;
a first grid of driving electrodes formed on the substrate;
a second grid of electrodes disposed adjacent to the first grid of electrodes and defining a gap therebetween;
a mixture of an organic light active particulate and a conductive carrier material, said mixture being disposed within said gap, said organic light active particulate comprised of first particles including a first electroluminescent conjugated polymer having a first turn-on voltage and second particles including a second electroluminescent conjugated polymer having a second turn-on voltage different than the first turn-on voltage, wherein light having a first color is emitted by the first electroluminescent conjugated polymer in response to the first turn-on voltage applied to the first electrode and the second electrode and light having a second color is emitted by the second electroluminescent conjugated polymer in response to the second turn-on voltage applied to the first electrode and the second electrode.
- a substrate;
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21. A method of forming a layered organic light active material particulate, comprising the steps of:
- forming a first mixture of a first organic light active component material and a first carrier fluid;
forming a second mixture of a second organic light active component material and a second carrier fluid;
generating a first mist of the first mixture in an environment so that a first particulate of the first organic light active component material is temporarily suspended in the environment;
generating a second mist of the second mixture in the environment so that a second particulate of the second organic light active component material is temporarily suspended in the environment; and
allowing the first particulate and the second particulate to commingle and attract together in the environment to form a first layered organic light active material particulate comprising a first layer of the first organic light active component material and a second layer of the second organic light active component material. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 31, 32)
- forming a first mixture of a first organic light active component material and a first carrier fluid;
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30. A method of forming a layered organic light active material particulate according to claim 30;
- further comprising the step of performing a characteristic enhancing treatment to the formed layered organic light active material particulate.
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33. A method for driving a multi-color light emitting device, the multi-color light emitting device capable of emitting two or more colors in sequence, each color being emitted in response to a respective different applied turn-on voltage, comprising the steps of:
- during an emission cycle applying a first turn-on voltage having a duration to the light emitting device so that a first burst of a predominant number of photons of a first color are emitted;
during the emission cycle applying a second turn-on voltage having a duration and at least one of a magnitude and a polarity different than a magnitude and polarity of the first turn-on voltage so that a second burst of a predominant number of photons of a second color are emitted, whereby during the emission cycle the first burst and the second burst occur in rapid succession and a human eye receiving the first burst and the second burst is stimulated to perceive a color different than the first color and the second color. - View Dependent Claims (34, 35, 36, 37)
- during an emission cycle applying a first turn-on voltage having a duration to the light emitting device so that a first burst of a predominant number of photons of a first color are emitted;
Specification