Organic EL device and preparation method
AssigneeTDK Corporation
InventorsEmiko Kambe, Masahiro Shinkai
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Abstract
In an organic EL device comprising a cathode, an anode, and two or more stacked organic layers therebetween including a light emitting layer, an electron injecting organic layer containing an organic salt or complex of a metal having a standard electrode potential of more negative than −1.8 V at 25° C. is formed close to the cathode by coating, and an organic layer containing a high molecular weight EL material is disposed close to the electron injecting organic layer. A multilayer structure of organic layers can be formed by coating, and the organic EL device has a high luminance, high efficiency, high reliability, long life and ease of handling.
Claims14
A method for preparing an organic EL device comprising a substrate, a first electrode on the substrate, two or more stacked organic layers including a light emitting layer on the first electrode, and a second electrode formed on the organic layers, at least one layer of said two or more organic layers being formed by coating, wherein
- an organic layer containing a high molecular weight EL material and an electron injecting organic layer containing at least one compound selected from organic metal salts and organic metal complexes of a metal having a standard electrode potential of more negative than −1.8 V at 25° C. are formed in a stacked manner,
- the electron injecting organic layer is formed contiguous to the first or second electrode by coating.
An organic EL device comprising a cathode, an anode, at least one organic layer therebetween including a light emitting layer, an electron injecting layer between the cathode and the organic layer, wherein
- the electron injecting layer contains at least one salt selected from inorganic metal salts and organic metal salts of a metal having a standard electrode potential of from −1.8 V to −0.8 V at 25° C.
Dependencies are inferred from the claim text.