US 6,635,988 B1Granted

Organic el device

AssigneeChisso Corporation

InventorsTakenori Izumizawa, Kenji Furukawa

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Abstract

An organic EL device having an organic EL structure which moisture does not enter and maintaining stable luminescence characteristics for a long period of time. An anode (2), and organic substance layer (3), and a cathode (4) are formed on a transparent substrate (1). A combination (insulating layer-moisture reaction layer combination) including an insulating layer (5) and a moisture reaction layer (6) formed on the insulating layer (5) covers an organic EL structure including the organic substance layer, the cathode, and a portion of the anode. The material of the moisture reaction layer (6) is a metal having a Pauling's electronegativity of less than 1.2. There are large differences in the number of dark spots produced and the growth of the dark spots between a metal; e.g., Ca (1.0), whose electronegativity is less than 1.2 and a metal; e.g., Mg (1.2), whose electronegativity is 1.2.

Claims7

Dependent claims

An organic EL device having an anode provided on the surface of a transparent substrate, a cathode facing the anode, and an organic substance layer provided between the anode and the cathode and containing a light-emitting layer, characterized in that at least one combination comprising an insulating layer and a moisture reaction layer provided on the insulating layer (insulating layer-moisture reaction layer combination) is provided such that the combination covers an organic EL structure including the organic substance layer, the cathode, and a portion of the anode wherein the moisture reaction layer contains a metal having a Pauling's electronegativity of less than 1.2, and a preliminary moisture reaction layer comprising a water-reactive substance dispersed in a polymer binder is provided over the organic EL structure including the organic substance layer, the cathode, a portion of the anode, and the insulating layer-moisture reaction layer combination, and the preliminary moisture reaction layer is molded by use of a seal-molding agent.

Dependencies are inferred from the claim text.