Bilayer eletron-injeting electrode for use in an electroluminescent device
AssigneeEastman Kodak Company
InventorsLiang-Sun Hung, Ching W. Tang
Life of this patent
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Abstract
An electroluminescent device comprising an anode, an electroluminescent layer, and a cathode. The cathode includes a fluoride layer contacting the electroluminescent layer, a conductive layer contacting the fluoride layer, and the thickness of the fluoride layer being selected so that the bilayer acts as an electron injecting contact, the bilayer providing stability against atmospheric corrosion.
Claims22
An electroluminescent device comprising an anode, an electroluminescent layer, and a cathode, said cathode comprises a bilayer structure, comprising:
- a) a fluoride layer contacting the electroluminescent layer;
- b) a conductive layer contacting the fluoride layer;
- and
- c) the thickness of the fluoride layer being selected so that the bilayer acts as an electron injecting contact, the bilayer providing stability against atmospheric corrosion.
In an electroluminescent device having, in sequence, a substrate, a transmissive and conductive hole-injecting anode, an organic electroluminescent layer, and a cathode in contact with the organic electroluminescent layer, the cathode layer comprising:
- a) a fluoride layer contacting the organic layer;
- b) a conductive overcoat layer over the fluoride layer;
- and
- c) the thickness of the fluoride layer being selected so that the bilayer acts as an electron injecting contact, the bilayer providing stability against atmospheric corrosion.
An electroluminescent device comprising:
- a single crystal semiconductor substrate,
- a bilayer electrode including a conductive layer on the substrate and an overlying fluoride layer, the thickness of the fluoride layer being in a range of 0.3 to 5nm;
- an organic electroluminescent layer;
- and
- a hole-injecting transparent electrode having a work function with a value greater than 4.1 eV.
Dependencies are inferred from the claim text.