Organic electroluminescent device having a stabilizing dopant in a hole-transport layer or in an electron-transport layer distant from the emission layer

An organic electroluminescent device comprising:

• a) a substrate;
• b) an anode and a cathode positioned relative to the substrate;
• c) an emission layer disposed between the anode and the cathode;
• d) a hole-transport layer disposed between the anode and the emission layer;
• e) an electron-transport layer disposed between the cathode and the emission layer;
• f) the electron-transport layer including two or more sublayers, one sublayer containing a stabilizing dopant, and the sublayer adjacent to the emission layer containing no stabilizing dopant;
• and
• g) the stabilizing dopant including rubrene or a derivative thereof.

An organic electroluminescent device comprising:

• a) a substrate;
• b) an anode and a cathode positioned relative to the substrate;
• c) an emission layer disposed between the anode and the cathode;
• d) a hole-transport layer disposed between the anode and the emission layer;
• e) an electron-transport layer disposed between the cathode and the emission layer;
• f) the electron-transport layer including two or more sublayers, one sublayer containing a stabilizing dopant, and the sublayer adjacent to the emission layer containing no stabilizing dopant;
• g) the hole-transport layer including two or more sublayers, one sublayer containing a stabilizing dopant, and the sublayer adjacent to the emission layer containing no stabilizing dopant;
• and
• h) the stabilizing dopant or dopants including rubrene or a derivative thereof.