Organic electroluminescent device with stabilized cathode
AssigneeEastman Kodak Company
InventorSteven A. VanSlyke
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Abstract
An organic electroluminescent device is disclosed which is protected from dark spot formation. The device is comprised of, in sequence, a support, an anode, an organic electroluminescent medium, and a cathode. The cathode contains a plurality of metals, at least one of which is a low work function metal other than an alkali metal. Overlying the cathode is a protective layer comprised of a mixture of at least one organic component of the organic electroluminescent medium and at least one metal having a work function in the range of from 4.0 to 4.5 eV capable of being oxidized in the presence of ambient moisture.
Claims14
An organic electroluminescent device comprising in sequence, a support, an anode, an organic electroluminescent medium, and a cathode,
- characterized in that
- said cathode is comprised of a layer consisting essentially of a plurality of metals other than alkali metals, at least one of said metals having a work function of less than 4 eV, and,
- overlying said cathode, a protective layer comprised of a mixture of
- at least one organic component of said organic electroluminescent medium and
- at least one metal having a work function in the range of from 4.0 to 4.5 eV capable of being oxidized in the presence of ambient moisture.
Dependencies are inferred from the claim text.