Opto-electrical devices
AssigneeCambridge Display Technology Limited
InventorsJeremy H. Burroughes, Julian C. Carter, Alec G. Gunner, Stephen K. Heeks, Ian S. Millard
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Abstract
An opto-electrical device comprising an anode electrode, a cathode electrode, and an opto-electrically active region located between the electrodes, the cathode electrode including a first layer comprising a material having a work function below 3.5 eV, a second layer of a different composition from the first layer, comprising another material having a work function below 3.5 eV, the second layer being further from the opto-electrically active region than the first layer, and a third layer comprising a material having a work function above 3.5 eV, the third layer being further from the opto-electrically active region than the first layer.
Claims28
An opto-electrical device comprising:
- an anode electrode;
- a transparent cathode electrode;
- and
- an opto-electrically active region located between the electrodes;
- the cathode electrode including:
- a first layer comprising a material having a work function below 3.5 eV;
- a second layer of a different composition from the first layer, comprising another material having a work function below 3.5 eV, the second layer being further from the opto-electrically active region than the first layer;
- and
- a third layer comprising a material having a work function above 3.5 eV, the third layer being further from the opto-electrically active region than the first layer.
A method for forming an opto-electrical device, the method comprising:
- depositing an anode electrode;
- depositing over the anode electrode a region of an opto-electrically active material;
- depositing over the region of opto-electrically active material a material having a work function below 3.5 eV to form a first transparent cathode layer;
- depositing over the first cathode layer another material having a work function below 3.5 eV to form a second transparent cathode layer of a different composition from the first transparent cathode layer;
- and
- depositing over the second transparent cathode layer a material having a work function above 3.5 eV to form a third transparent cathode layer.
Dependencies are inferred from the claim text.