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US 4,885,211 AGranted
Electroluminescent device with improved cathode
AssigneeEastman Kodak Company
InventorsChing W. Tang, Steven A. VanSlyke
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Abstract
An electroluminescent device is disclosed comprised of, in sequence, an anode, an organic hole transporting zone, an organic electron transporting zone, and a cathode. The cathode is comprised of a layer of a plurality of metals other than alkali metals, at least one of said metals having a work function of less than 4 eV.
Claims23
An electroluminescent device comprising in sequence, an anode, an organic hole transporting zone, an organic electron transporting zone, and a cathode, characterized in that
- said cathode is comprised of a layer having a sheet resistance of less than 100 ohms per square consisting essentially of at least 50 percent magnesium and at least 0.1 percent of a metal having a work function greater than 4 eV, said metal percentages being based on total metal atoms present in said cathode layer.
An electroluminescent device comprising in sequence,
- an opaque anode comprised of a metal having a work function greater than 4 eV,
- an organic luminescent medium consisting of
- an organic hole transporting zone and
- a chelated oxinoid electron transporting zone, and
- a light transmissive cathode consisting essentially of a vacuum vapor deposited layer having a thickness of from 50 to 250 Angstroms and a sheet resistance of less than 100 ohms per square consisting essentially of magnesium and silver,
- said silver being present in a concentration of from 0.1 to 50 percent, based on total magnesium and silver atoms present.
3 more elements
Dependencies are inferred from the claim text.