OLED efficiency by utilization of different doping concentrations within the device emissive layer
First Claim
1. An organic light emitting device comprising an emissive layer disposed between and electrically connected to an anode and a cathode, wherein the emissive layer comprises a host material and a phosphorescent emissive material, and wherein the concentration of the phosphorescent emissive material in the host material on the anode-side of the emissive layer is about 1% to about 50%, the concentration of the phosphorescent emissive material in the host material on the cathode-side of the emissive layer is about 0.5% to about 20%, and the difference between the concentrations of the phosphorescent emissive material in the host material on the anode-side of the emissive layer and the cathode side of the emissive layer is at least about 0.5%.
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Abstract
The present invention relates to organic light emitting devices (OLEDs), and more specifically to an OLED device structure that provides improved performance characteristics, such as increased luminous efficiency and improved lifetime. The OLEDs of present invention comprise an emissive layer in which an emissive dopant is non-uniformly doped into a host material.
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Citations
42 Claims
- 1. An organic light emitting device comprising an emissive layer disposed between and electrically connected to an anode and a cathode, wherein the emissive layer comprises a host material and a phosphorescent emissive material, and wherein the concentration of the phosphorescent emissive material in the host material on the anode-side of the emissive layer is about 1% to about 50%, the concentration of the phosphorescent emissive material in the host material on the cathode-side of the emissive layer is about 0.5% to about 20%, and the difference between the concentrations of the phosphorescent emissive material in the host material on the anode-side of the emissive layer and the cathode side of the emissive layer is at least about 0.5%.
- 12. An organic light emitting device comprising an emissive layer disposed between and electrically connected to an anode and a cathode, wherein the emissive layer comprises a host material and a phosphorescent emissive material, and wherein the concentration of the phosphorescent emissive material in the host material on the anode-side of the emissive layer is about 1% to about 50%, the concentration of the phosphorescent emissive material in the host material on the cathode-side of the emissive layer is about 0.5% to about 20%, and the ratio of the concentrations of the phosphorescent emissive material in the host material on the anode-side of the emissive layer to the cathode side of the emissive layer is at least about 1.25:
- 23. An organic light emitting device comprising an emissive layer disposed between and electrically connected to an anode and a cathode, wherein the emissive layer comprises a host material and a phosphorescent emissive material, and wherein the concentration of the phosphorescent emissive material in the host material on the cathode-side of the emissive layer is about 1% to about 50%, the concentration of the phosphorescent emissive material in the host material on the anode-side of the emissive layer is about 0.5% to about 20%, and the difference between the concentrations of the phosphorescent emissive material in the host material on the cathode-side of the emissive layer and the anode-side of the emissive layer is at least about 0.5%.
- 32. An organic light emitting device comprising an emissive layer disposed between and electrically connected to an anode and a cathode, wherein the emissive layer comprises a host material and a phosphorescent emissive material, and wherein the concentration of the phosphorescent emissive material in the host material on the cathode-side of the emissive layer is about 1% to about 50%, the concentration of the phosphorescent emissive material in the host material on the anode-side of the emissive layer is about 0.5% to about 20%, and the ratio of the concentrations of the phosphorescent emissive material in the host material on the cathode-side of the emissive layer to the anode-side of the emissive layer is at least about 1.25:
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41. An organic light emitting device comprising an emissive layer disposed between and electrically connected to an anode and a cathode, wherein the emissive layer comprises a first sublayer, a second sublayer and a third sublayer, each of which comprises a host material and a phosphorescent emissive material, wherein:
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the first sublayer is on the anode-side of the emissive layer and the concentration of the phosphorescent emissive material in the host material in the first sublayer is about 1% to about 50%; the third sublayer is on the cathode-side of the emissive layer and the concentration of the phosphorescent emissive material in the host material in the third sublayer is about 1% to about 50%; and the second sublayer is disposed between the first sublayer and the third sublayer, and the concentration of the phosphorescent emissive material in the second sublayer is about 0.5% to about 20%; and wherein the difference between the concentrations of the phosphorescent emissive material in the host material in the first sublayer and in the second sublayer is at least about 0.5%, wherein the first sublayer has a higher concentration of the phosphorescent emissive material than the second sublayer, and the difference between the concentrations of the phosphorescent emissive material in the host material in the third sublayer and the second sublayer is at least about 0.5%, wherein the third sublayer has a higher concentration of the phosphorescent emissive material than the second sublayer.
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42. An organic light emitting device comprising an emissive layer disposed between and electrically connected to an anode and a cathode, wherein the emissive layer comprises a first sublayer, a second sublayer and a third sublayer, each of which comprises a host material and a phosphorescent emissive material, wherein:
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the first sublayer is on the anode-side of the emissive layer and the concentration of the phosphorescent emissive material in the host material in the first sublayer is about 1% to about 50%; the third sublayer is on the cathode-side of the emissive layer and the concentration of the phosphorescent emissive material in the host material in the third sublayer about is 1% to about 50%; and the second sublayer is disposed between the first sublayer and the third sublayer, and the concentration of the phosphorescent emissive material in the second sublayer is about 0.5% to about 20%; and wherein the ratio of the concentrations of the phosphorescent emissive material in the host material in the first sublayer and in the second sublayer is at least about 1.25;
1, and the ratio of the concentrations of the phosphorescent emissive material in the host material in the third sub layer and in the second sublayer is at least about 1.25;
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Specification