Organic light-emitting diode with doped layers

摘要

The invention concerns an organic light-emitting diode comprising a lower electrode (2) and an upper electrode (8), an electroluminescent organic layer (5), and at least one doped organic layer (3; 7) in contact with one of said electrodes. The invention is characterized in that the doping is carried out using an alkaline-earth element or lanthanide, and the diode is heat-treated at temperature preferably not less than 60° C. for more than one hour. The invention enables the lighting performance of the diode to be considerably improved.

主权项

1. A method for realizing a diode comprising:
providing a substrate with a cathode electrode; depositing a layer of bathophenanthroline-based organic material doped with calcium in contact with the cathode electrode, the doping level of calcium being higher at the interface of the bathophenanthroline-based organic material and the cathode electrode than it is at the center of the layer of bathophenanthroline-based organic material; depositing a light-emitting organic layer on the bathophenanthroline-based organic material; depositing an anode electrode on the light-emitting organic layer; and after depositing the electrodes and layers, performing a thermal treatment at a temperature greater than or equal to 80° C.