Organic light-emitting diode including an electron transport layer stack comprising different lithium compounds and elemental metal
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United States of America Patent
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Jun 30, 2020
Grant Date -
Sep 28, 2017
app pub date -
Sep 17, 2015
filing date -
Sep 19, 2014
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Abstract
The present invention relates to a an organic light-emitting diode (OLED, 100) comprising at least one emission layer (150), and an electron transport layer stack (160) of at least two electron transport layers, wherein a first electron transport layer (161, 162) and a second electron transport layer (162, 161) comprises at least one matrix compound and in addition, —the at least first electron transport layer comprises a lithium halide or a lithium organic complex; and the at least second electron transport layer comprises an elemental metal selected from the group of lithium, magnesium and/or ytterbium; or—the at least first electron transport layer comprises an elemental metal selected from the group of lithium, magnesium and/or ytterbium; and the at least second electron transport layer comprises a lithium halide or a lithium organic complex; wherein the electron transport layer or layers comprising a lithium halide or a lithium organic complex is free of an elemental metal, and the electron transport layer or layers that comprises an elemental metal is free of a metal salt and/or a metal organic complex.
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