Organic electroluminescence element
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United States of America Patent
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Nov 20, 2012
Grant Date -
Apr 9, 2009
app pub date -
May 11, 2006
filing date -
May 11, 2005
priority date (Note) -
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Abstract
An organic EL (electroluminescence) element capable of efficiently recombining holes and electrons in a light emitting layer and also improving efficiency and lifetime of the element. The element comprises electrodes 1 and 2, the light emitting layer 4, and transport layers 3 and 5 that transport holes and electrons to the layer 4. The layer 4 contains compound functioning as electron accepting dopant and/or substance functioning as electron donating dopant. Accordingly, it is possible to optimize the injection valance of holes or electrons into the layer 4.
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