OLED with protective bi-layer electrode
View Patent ↗An OLED device, comprising: a substrate; a first electrode formed over the substrate; one or more organic layers formed over the first electrode, at least one organic layer being a light-emitting layer; and a bi-layer electrode comprising a first transparent conductive protective hermetic layer formed over the one or more organic layers, and a second transparent conductive non-hermetic layer formed over the first transparent conductive protective hermetic layer.
1. An OLED device, comprising:
a substrate;
a first electrode formed over the substrate;
one or more organic layers formed over the first electrode, at least one organic layer being a light-emitting layer;
a bi-layer electrode comprising a first transparent conductive protective hermetic layer formed over the one or more organic layers, and a second transparent conductive non-hermetic layer formed over the first transparent conductive protective hermetic layer; and
wherein the first transparent conductive protective hermetic layer includes metal oxide molecules, the second transparent conductive non-hermetic layer includes metal oxide molecules, the conductivity and the thickness of the first transparent conductive protective hermetic layer are both less than those of the second transparent conductive non-hermetic layer, and the metal oxide molecules of the first transparent conductive protective hermetic layer are arranged in a regular array and the metal oxide molecules of the second transparent conductive non-hermetic layer are randomly arranged.
2. The OLED device of claim 1 , wherein the first and second conductive layers are metal oxide layers.
3. The OLED device of claim 1 , wherein the first transparent conductive protective layer has thickness of less than 100 nm.
4. The OLED device of claim 1 , wherein the first transparent conductive protective layer has thickness of less than 75 nm.
5. The OLED device of claim 1 , wherein the second transparent conductive layer is formed by sputtering or evaporation.
6. The OLED device of claim 1 , wherein the first transparent conductive protective layer is formed by atomic layer deposition or chemical vapor deposition.
7. The OLED device of claim 1 , further comprising a patterned auxiliary electrode in electrical contact with the hi-layer electrode.
8. The OLED device of claim 1 , wherein first transparent conductive protective layer has a first conductivity and the second transparent conductive layer has a second conductivity greater than the first conductivity.
9. The OLED device of claim 1 , wherein first transparent conductive protective layer has a resistivity of less than 10,000 Ohm/sq.
10. The OLED device of claim 1 , wherein the first and second conductive layers have approximately the same refractive index.
11. The OLED device of claim 1 , wherein the first and second conductive layers have an optical index equal to or greater than the refractive index of the light-emitting layer.
12. The OLED device of claim 1 , wherein the first transparent conductive protective layer has a refractive index equal to or lower than the second conductive layer and equal to or greater than the refractive index of the light-emitting layer.
13. The OLED device of claim 1 , further comprising an element formed on a side of the bi-layer electrode opposite the one or more organic layers, the element having a refractive index less than the refractive index of the light-emitting layer.
14. The OLED device of claim 1 , further comprising a scattering layer formed on the bi-layer electrode.
15. The OLED device of claim 1 , wherein the first transparent conductive protective layer comprises zinc oxide or doped zinc oxide, or aluminum zinc oxide.
16. The OLED device of claim 1 , wherein the second transparent conductive layer comprises indium tin oxide.