Non-degenerate wide bandgap semiconductors as injection layers and/or contact electrodes for organic electroluminescent devices

An organic light emitting device comprising:

• a substrate;
• two contact electrodes, one thereof serving as an anode and the other one serving as a cathode;
• and
• an organic region in which electroluminescence takes place if a voltage is applied between the contact electrodes,
• wherein at least one of the contact electrodes comprises a non-degenerate wide bandgap semiconductor having a bandgap of at least 2.5 eV, such that,
• if that contact electrode serves as a cathode, the non-degenerate wide bandgap semiconductor conduction band is aligned with respect to the LUMO of the organic region for injection of electrons from the conduction band (CB) of the non-degenerate wide bandgap semiconductor into the LUMO of the organic region, thereby essentially eliminating an electron-injection energy barrier, or such that,
• if that contact electrode serves as an anode, the non-degenerate wide bandgap semiconductor valence band is aligned with respect to the HOMO of the organic region for injection of holes from the valence band (VB) of the non-degenerate wide bandgap semiconductor into the HOMO of the organic region, thereby essentially eliminating a hole-injection energy barrier.