Organic electroluminescence element, organic electroluminescence device, organic el display device, and organic el lighting
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United States of America Patent
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Jun 17, 2014
Grant Date -
May 30, 2013
app pub date -
Jan 8, 2013
filing date -
Jul 8, 2010
priority date (Note) -
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Abstract
The present invention relates to an organic electroluminescence element which comprises an anode, a luminescent layer, two or more electron transport layers and a cathode, in this order, wherein at least one of the two or more electron transport layers adjoins the luminescent layer, the luminescent layer contains a luminescent material and a charge transport material, the electron transport layer which adjoins the luminescent layer contains a charge transport material, the charge transport material contained in the luminescent layer and the charge transport material contained in the electron transport layer which adjoins the luminescent layer may be the same material or may be different material, and the specific electron affinities EA1, EA2 and EA3, and the specific work function WF satisfy the specific relationship.
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