Organic electroluminescence device
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United States of America Patent
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Apr 21, 2015
Grant Date -
Jul 23, 2009
app pub date -
Dec 15, 2006
filing date -
Dec 16, 2005
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Abstract
Disclosed is an organic electroluminescence device having a longer drive life. The organic electroluminescence device includes a light emitting layer which contains a luminescent dye and a host material having a nitrogen-containing aromatic heterocyclic ring. The luminescence resulting from the hole transport layer adjacent to the light emitting layer is less than one-hundredth of the luminescence resulting from the luminescent dye.
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