An organic light emitting diode (OLED) of the electron injection layer

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.