Tandem OLED having stable intermediate connectors
AssigneeEastman Kodak Company
InventorsLiang-Sheng Liao, Ching W. Tang
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Abstract
A tandem OLED includes an anode, a cathode, and a plurality of organic electroluminescent units disposed between the anode and the cathode, wherein each organic electroluminescent unit includes at least one light-emitting layer, and an intermediate connector disposed between each adjacent organic electroluminescent unit, wherein the intermediate connector includes at least a high work function metal layer having a work function of no less than 4.0 eV and a metal compound layer, wherein the intermediate connector has a sheet resistance of higher than 100 kΩ per square, and wherein the high work function metal layer improves the operational stability of the OLED.
Claims28
A tandem OLED comprising:
- a) an anode;
- b) a cathode;
- c) a plurality of organic electroluminescent units disposed between the anode and the cathode, wherein each organic electroluminescent unit includes at least one light-emitting layer;
- and
- d) an intermediate connector disposed between each adjacent organic electroluminescent unit, wherein the intermediate connector includes at least a high work function metal layer having a work function of no less than 4.0 eV and a metal compound layer, wherein the intermediate connector has a sheet resistance of higher than 100 kΩ per square, wherein the intermediate connector is unpattemed, and wherein the high work function metal layer improves the operational stability of the OLED.
Dependencies are inferred from the claim text.