Back to results
US 5,747,930 AGranted
Organic thin film electroluminescent device
AssigneeNEC Corporation
InventorKoji Utsugi
Life of this patent
Estimating the term…
Abstract
A cathode is formed of an alloy, which includes 0.01 to 5 mol % of scandium and 0.01 to 0.3 mol % of alkali metal. Base of the alloy has a work function greater than or equal to 4 eV and is silver, aluminum, or indium or the alloy thereof. Thickness of the cathode is preferably 1 to 30 nm. Also, as a cathode protection layer, an aluminum alloy is formed on the cathode in a thickness greater than or equal to 50 nm, the aluminum alloy containing 0.1 to 5 mol % of silicon, copper, scandium and/or manganese.
Claims7
An organic thin film electroluminescent diode comprising:
- an anode;
- a cathode including a metal or alloy, the metal or alloy having a work function greater than or equal to 4 eV, the cathode further including 0.01 to 5 mol % of scandium and 0.01 to 0.3 mol % of alkali metal;
- and
- an organic thin film layer disposed between said anode and cathode and having at least one light emitting layer.
1 more element
An organic thin film electroluminescent diode, comprising:
- an anode;
- a cathode formed of a metal or alloy containing 0.01 to 5 mol % of scandium and 0.01 to 0.3 mol % of alkali metal;
- and
- an organic thin film layer disposed between said anode and cathode and having at least one light emitting layer,
- wherein said cathode is formed of a material selected from a group consisting of silver, aluminum, indium, and an alloy thereof, the material containing said scandium and alkali metal.
2 more elements
Dependencies are inferred from the claim text.