Organic light-emitting device with light transmissive anode and light transmissive cathode including zinc-doped indium oxide
AssigneeTDK Corporation
InventorMichio Arai
Life of this patent
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Abstract
An organic EL light emitting device has a light emitting layer between a cathode and an anode. Both the cathode and the anode are light transmissive. The cathode includes a conductor layer of a metal or alloy with a work function of up to 4 eV having a thickness of up to 10 nm on the light emitting layer side, a transparent electrode of zinc-doped indium oxide on a side remote from the light emitting layer, and optionally a buffer layer between the conductor layer and the transparent electrode. Light emission can exit from the device on both the cathode and anode sides.
Claims9
An organic electroluminescent light emitting device comprising a cathode, an anode, and a light emitting layer therebetween;
- both the cathode and the anode being light transmissive;
- the cathode comprising a conductor layer and a transparent electrode;
- the conductor layer having a thickness of up to 10 nm, being in contact with the transparent electrode, being closer to the light emitting layer than the transparent electrode, and comprising a metal or alloy, the metal or alloy having a work function of up to 4 eV;
- and
- the transparent electrode comprising zinc-doped indium oxide, wherein
- the zinc-doped indium oxide is represented by InO.sub.y.ZnO.sub.z, where y is 1.0 to 2.0 and z is 0.8 to 1.2.
Dependencies are inferred from the claim text.