| 摘要 |
Organic materials doped with an alkali metal have been conventionally used for electron-transporting layers or electron injection layers which constitute light-emitting films in organic EL light-emitting elements which are used in displays or illuminating devices. Such conventional organic materials involve problems such that a strict process control is required since the alkali metal is highly reactive and thus likely to be formed into a hydroxide, such that the resulting light-emitting element or light-emitting device needs complete sealing, and such that life of the light-emitting element cannot be sufficiently long. The present invention uses an alkali metal- containing fullerene or an organic material doped with an alkali metal- containing fullerene for electron-transporting layers or electron injection layers which constitute light-emitting films in organic EL light-emitting elements. The alkali metal-containing fullerene or the organic material doped with an alkali metal-containing fullerene is not very reactive with moisture in the atmosphere or other impurities and thus the process control thereof is easy. Furthermore, even with a simple sealing structure, the resulting light-emitting element can have sufficiently long life.
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