ORGANIC LIGHT-EMITTING DIODE HAVING DOPED LAYERS

摘要

Organic light-emitting diode comprising a lower electrode (2) and an upper electrode (8), an organic electroluminescent layer (5) and at least one doped organic layer (3; 7) in contact with one of said electrodes. According to the invention, the doping level of this organic layer is higher at the interface with the electrode than in the core of this layer (3).;Thanks to the invention, the luminous efficiency of the diode is very substantially improved.

主权项

1. An organic light-emitting diode comprising:
a substrate, a lower electrode of a first kind on the same side as the substrate and an upper electrode of a second kind on the opposite side to the substrate, the electrode kinds corresponding to anode and cathode, an organic emissive electroluminescent layer that is inserted between the lower electrode and the upper electrode, and at least one layer) made of doped organic material in contact with one of said electrodes, which layer is inserted between this electrode and said electroluminescent layer, said organic material being doped with a donor dopant if said electrode in contact with it is a cathode and/or with an accepter dopant if said electrode in contact with it is an anode,characterized in that the level of doping of at least one doped organic layer is higher at the interface between this organic layer and the electrode with which this layer is in contact than in the core of this doped organic layer.