Light Emitting Device with High Outcoupling
First Claim
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1. A device comprising:
- a substrate comprising an outcoupling surface treatment;
a first electrode disposed over the substrate, the first electrode comprising a first electrode material;
an emissive stack disposed over the first electrode, the emissive stack comprising at least one emissive material; and
a second electrode disposed over the emissive stack;
wherein the first electrode material has a lower index of refraction than the substrate.
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Abstract
Organic light emitting devices having a low-index electrode and a substrate with a surface treatment are provided. The combination of a relatively low-index electrode and a surface-treated substrate may eliminate guided modes and increase the light outcoupled by the device. It has been found that the combination surprisingly provides up to 1.5 times more outcoupled light than would be expected based on the performance of similar devices having higher-index electrodes.
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Citations
23 Claims
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1. A device comprising:
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a substrate comprising an outcoupling surface treatment; a first electrode disposed over the substrate, the first electrode comprising a first electrode material; an emissive stack disposed over the first electrode, the emissive stack comprising at least one emissive material; and a second electrode disposed over the emissive stack; wherein the first electrode material has a lower index of refraction than the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A device comprising:
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a substrate comprising an outcoupling surface treatment; a first electrode disposed over the substrate, the first electrode comprising a first electrode material; an emissive stack disposed over the first electrode, the emissive stack comprising at least one emissive material; and a second electrode disposed over the emissive stack; wherein the first electrode material has a lower index of refraction than at least one emissive material in the emissive stack.
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Specification