Organic electroluminescent device with stabilizing cathode capping layer
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United States of America Patent
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Oct 22, 1991
Grant Date -
N/A
app pub date -
Jul 26, 1990
filing date -
Jul 26, 1990
priority date (Note) -
Expired
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Abstract
An organic electroluminescent device is disclosed which is protected from dark spot formation. The device is comprised of, in sequence, a support, an anode, an organic electroluminescent medium, and a cathode containing a plurality of metals other than alkali metals. The cathode is comprised of a capping layer containing at least one alkaline earth or rare earth metal and, interposed between the capping layer and the organic electroluminescent medium, an electron injecting layer containing at least one metal having a work function of less than 4.0, but exhibiting a higher work function than the alkaline earth or rare earth metals in the capping layer.
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