ORGANIC LIGHT-EMITTING DIODE INCLUDING AN ELECTRON TRANSPORT LAYER STACK COMPRISING DIFFERENT LITHIUM COMPOUNDS AND ELEMENTAL METAL

The present invention relates to a an organic light-emitting diode (100, OLED) comprising an emission layer (150) and an electron transport layer stack of at least two electron transport layers (161, 162), wherein a first electron transport layer (161) and a second electron transport layer (162) comprise at least one matrix compound and in addition, - the at least first electron transport layer (161) comprises a lithium halide or a lithium organic complex; and the at least second electron transport layer (162) comprises an elemental metal selected from the group of lithium, magnesium and/or ytterbium; or - the at least first electron transport layer (161) comprises an elemental metal selected from the group of lithium, magnesium and/or ytterbium; and the at least second electron transport layer (162) 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.