Organic Light Emitting Device With a Plurality of Organic Electroluminescent Units Stacked Upon Each Other
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United States of America Patent
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Issued Date -
Jan 8, 2009
app pub date -
Dec 22, 2006
filing date -
Dec 23, 2005
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Abandoned
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Abstract
The invention relates to an organic light emitting device comprising an anode (2); a cathode (4); and a plurality of organic electroluminescent units (3.1, . . . , 3.m; m.gtoreq.2) provided upon each other in a stack or an inverted stack between said anode (2) and said cathode (4) each of said organic electroluminescent units (3.1, . . . , 3.m) comprising an electroluminescent zone; wherein at least some of the organic electroluminescent units (3.2, . . . , 3.m) comprise a p-type doped hole transporting-layer and/or an n-type doped electron-transporting layer.
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