Optically transparent diffusion barrier and top electrode in organic light emitting diode structures
AssigneeInternational Business Machines Corporation
InventorsRichard Alan Haight, Ronald Roy Troutman
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Abstract
In the formation of organic light emitting diodes with a transparent top electrode, it was discovered that many of the materials used for this electrode can readily diffuse at room temperature into the organic films, creating shorts and otherwise compromising the performance of the diode. A solution to this problem is disclosed which involves a method for the creation of a diffusion barrier which prevents diffusion of electrode materials into the substrate while enhancing the ability of the OLED to emit light through the top electrode.
Claims18
Organic light emitting device having
- a) a substrate,
- b) two contact electrodes, one thereof serving as an anode and the other serving as a cathode,
- c) an organic region situated between said two contact electrodes in which electroluminescence takes place if a voltage is applied between said two electrodes, and
- d) a barrier layer between said organic region and at least one of said contact electrodes.
An organic light emitting device having
- a) a substrate and a
- b) structure forming a transparent top electrode, said structure consisting of a stack of organic layers, the last of which is an organic underlayer, said organic underlayer having thereon a themally evaporated thin metal film covered by a transparent conductor selected from the group consisting of ITO, InO, ZnS, ZnSe, GaN, or a combination thereof.
Dependencies are inferred from the claim text.