ELECTRON INJECTION LAYER FOR AN ORGANIC LIGHT-EMITTING DIODE (OLED)

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The invention relates to Organic light emitting diode comprising at least one emission layer, an electron injection layer and at least one cathode electrode, wherein : - the electron injection layer comprises an organic phosphine compound, wherein the electron injection layer is free of a metal, metal salt, metal complex and metal organic compound; - the cathode electrode comprises at least a first cathode electrode layer, wherein - the first cathode electrode layer comprises a first zero-valent metal selected from the group comprising alkali metal, alkaline earth metal, rare earth metal and/or a group 3 transition metal; and - the electron injection layer is arranged in direct contact to the first cathode electrode layer.