Electroluminescent devices and processes using polythiophenes
OwnerParag G. Mehtainventor
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Abstract
Electroluminescent devices have, as the active layer, a polymer comprising a poly(3-substituted thiophene), the 3-substituent of which is an alkyl, cycloalkyl, alkoxy, cycloalkoxy, alkoxyalkyl, fluorocarbon, siloxyl or heteroorganic group, the poly(3-substituted thiophene) having a head-to-tail ratio of at least about 80 percent. Such devices give better electroluminescent performance than similar devices using a poly(3-substituted thiophene) having a lower head-to-tail ratio.
Claims18
A process for generating electromagnetic radiation, which process comprises:
- providing first and second electrodes;
- providing a layer of an electroluminescent polymer disposed between, and in electrical contact with, the first and second electrodes, the electroluminescent polymer comprising a poly(3-substituted thiophene), the 3-substituent of which is an alkyl, cycloalkyl, alkoxy, cycloalkoxy, alkoxyalkyl, fluorocarbon, siloxyl or heteroorganic group, the poly(3-substituted thiophene) having a head-to-tail ratio of at least about 80 percent;
- and
- applying a potential difference between the first and second electrodes sufficient to cause current to flow from the first electrode to the second electrode and electromagnetic radiation to be emitted from the layer of electroluminescent polymer.
An electroluminescent device comprising a first electrode, and a second electrode having a work function different from that of the first electrode, the device further comprising a layer of an electroluminescent polymer disposed between, and in electrical contact with, the first and second electrodes, the electroluminescent polymer comprising a poly(3-substituted thiophene), the 3-substituent of which is an alkyl, cycloalkyl, alkoxy, cycloalkoxy, alkoxyalkyl, fluorocarbon, siloxyl or heteroorganic group, the poly(3-substituted thiophene) having a head-to-tail ratio of at least about 80 percent.
An electroluminescent device according to claim 9 wherein the poly(3-substituted thiophene) has a head-to-tail ratio of at least about 90 percent.
A process for generating electromagnetic radiation, which process comprises:
- providing first and second electrodes;
- providing a layer of an electroluminescent polymer disposed between, and in electrical contact with, the first and second electrodes, the electroluminescent polymer comprising a poly(3-substituted thiophene), the 3-substituent of which is an alkyl, cycloalkyl, alkoxy, cycloalkoxy, alkoxyalkyl, fluorocarbon, siloxyl or heteroorganic group, the poly(3-substituted thiophene) having a head-to-tail ratio of at least about 80 percent and not more than about 90 percent;
- and
- applying a potential difference between the first and second electrodes sufficient to cause current to flow from the first electrode to the second electrode and electromagnetic radiation to be emitted from the layer of electroluminescent polymer.
An electroluminescent device comprising a first electrode, and a second electrode having a work function different from that of the first electrode, the device further comprising a layer of an electroluminescent polymer disposed between, and in electrical contact with, the first and second electrodes, the electroluminescent polymer comprising a poly(3-substituted thiophene), the 3-substituent of which is an alkyl, cycloalkyl, alkoxy, cycloalkoxy, alkoxyalkyl, fluorocarbon, siloxyl or heteroorganic group, the poly(3-substituted thiophene) having a head-to-tail ratio of at least about 80 percent and not more than about 90 percent.
Dependencies are inferred from the claim text.