Organic light-emitting diode with relief patterns

An organic light-emitting diode comprising on a substrate, from the rear face to the front face, at least one rear electrode of a first type surmounted by an organic light-emitting layer, surmounted by at least one front electrode of a second type, the organic light-emitting layer producing light when holes and electrons are injected into it by a current flowing through the electrodes, the electrode types corresponding to an anode and a cathode, at least one of the electrodes being semi-transparent for the produced light in order to allow it to escape through one of the faces of said diode, referred to as the exit face, said semi-transparent electrode comprising at least one transparent extraction zone and at least one reflective zone adapted to return the produced light through the light-emitting layer;

• said diode else comprising reflector means which are arranged on the opposite side of said semi-transparent electrode from the organic light-emitting layer and for returning the produced light to said semi-transparent electrode through the light-emitting layer;
• wherein the reflector means, and the semi-transparent electrode sit on relief patterns;
• the organic light-emitting diode comprising, between the organic light-emitting layer and said semi-transparent electrode and adjacent to said semi-transparent electrode, a transparent organic layer whose thickness varies alone its interface with said semi-transparent electrode such as to said relief patterns and such that the surface of the interface between this semi-transparent electrode and this transparent organic layer is not-parallel to the surface of reflection of the reflector means;
• wherein the transparent organic layer is able to transport charges;
• wherein the thickness variability of said transparent organic layer is greater than or equal to 200 nm;
• and
• wherein the semi-transparent electrode with its extraction zones and its reflective zones comprises:
• a substantially transparent conductive layer extending both over the reflective zones and over the extraction zones,
• and, extending only over the reflective zones, a conductive reflective metallic layer adjacent to said transparent conductive layer, wherein said reflective layer has a surface conductivity at least ten times greater than the surface conductivity of the substantially transparent conductive layer.