Organic electroluminescent devices with improved stability and efficiency

An organic luminescent layer for use in an electroluminescent device with improved operating life, comprising:

• a) an organic host material capable of sustaining both hole and electron injection and recombination wherein the host material includes Alq;
• and
• and
• b) at least three dopants:
• i) a first dopant capable of accepting energy of electron hole combination in the host material;
• ii) a second dopant capable of trapping the holes from the host material;
• and
• iii) a third dopant capable of accepting energy from the electron hole combination in the host material and accepting energy transferred from the second dopant;
• c) the first dopant being selected so that the bandgap energy of the first dopant is less than the bandgap energy of the host material;
• and
• d) the second dopant being selected to have a hole trapping energy level above the valence band of the host material;
• and
• e) the third dopant having a bandgap energy less than the bandgap energy of the first dopant.