Magnetic field dependent triplet-triplet annihilation in [Alq.sub.3]-based organic light emitting diodes at different temperatures

The magnetic field dependent current and electroluminescence (EL) of aluminum tris-(8-hydroxyquinoline) ([Alq.sub.3])-based organic light emitting diodes (OLEDs) are measured at different temperatures. The high field decrease in the EL is weakened and vanishes at higher temperatures, which is due to the field affected triplet-triplet annihilation process.