| 摘要 |
In an organic EL device comprising on a substrate (1), a hole injecting electrode (2), an organic layer (4) having a light emitting function, a buffer layer (6), and an electron injecting electrode (7), the electron injecting electrode (7) is constructed of a metal, metal oxide or metal halide, especially Al-Li alloy, and the buffer layer (6) is constructed of a porphyrin or naphthacene compound. The device can be manufactured without damages to the organic layer and has a low initial drive voltage, a low emission start voltage, a high efficiency, and minimized dark spot growth and hence a long lifetime.
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