Doping of organic opto-electronic devices to extend reliability
First Claim
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1. An organic layer in an opto-electronic device comprising:
- a host material that is morphologically unstable, the host material comprising a hole blocking material or an exciton blocking material; and
a dopant material that enhances the morphological stability of the host material,wherein the dopant material is present in the host material at a concentration of 50% by weight or less, and wherein the organic layer does not have an emissive function in the device.
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Abstract
The present invention is directed to multi-layer organic devices having improved stability, wherein at least one layer of the device comprises a host material that is morphologically unstable and a dopant material that provides improved morphological properties to the layer. The layer may be incorporated into, for example, OLEDs, organic phototransistors, organic photovoltaic cells, and organic photodetectors.
37 Citations
26 Claims
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1. An organic layer in an opto-electronic device comprising:
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a host material that is morphologically unstable, the host material comprising a hole blocking material or an exciton blocking material; and a dopant material that enhances the morphological stability of the host material, wherein the dopant material is present in the host material at a concentration of 50% by weight or less, and wherein the organic layer does not have an emissive function in the device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An organic light emitting device comprising
an anode; -
a cathode; a first organic layer disposed between and in electrical connection with the anode and the cathode, wherein the first organic layer is an emissive layer; and a second organic layer disposed between the first organic layer and the cathode or between the first organic layer and the anode, wherein the second organic layer is a blocking layer, wherein the second organic layer comprises; a host material that is morphologically unstable; and a dopant material that enhances the morphological stability of the host material, wherein the dopant material is present in the host material at a concentration of 50% by weight or less, and wherein the device has a lifetime that is at least about 25% longer than an analogous device having a second organic layer that does not contain the dopant material. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An organic light emitting device comprising:
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an anode; a cathode; a first organic layer disposed between and in electrical connection with the anode and the cathode, wherein the first organic layer is an emissive layer; and a second organic layer disposed between the first organic layer and the cathode or between the first organic layer and the anode, wherein the second organic layer comprises; a mixture of a host material that is morphologically unstable, and a dopant material that enhances the morphological stability of the host material, wherein the dopant material is present in the host material at a concentration of 50% by weight or less, the host material is a hole blocking material or an exciton blocking material that becomes at least 20% crystalline after 100 hours at 35°
C. when deposited as a initially amorphous this film, andthe mixture of the host material and the dopant material does not become more than 10% crystalline after 100 hours at 35°
C. when deposited as a initially amorphous this film.
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23. An organic light emitting device comprising:
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an anode; a cathode; a first organic layer disposed between and in electrical contact with the anode and the cathode, wherein the first organic layer is an emissive layer; a second organic layer disposed between the first organic layer and the cathode or between the first organic layer and the anode, wherein the second organic layer is a hole blocking layer or an exciton blocking layer disposed adjacent to the first organic layer, the second organic layer comprising; a mixture of a host material that is morphologically unstable, and a dopant material that enhances the morphological stability of the host material, wherein the dopant material is present in the host material at a concentration of 50% by weight or less. - View Dependent Claims (24, 25)
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26. An organic layer in an opto-electronic device comprising:
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a host material that is morphologically unstable, the host material comprising a polymeric material; and a dopant material that enhances the morphological stability of the host material, wherein the dopant material is present in the host material at a concentration of 50% by weight or less, and wherein the organic layer does not have an emissive function in the device.
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Specification