Magnetoelectroluminescence in tris (8-hydroxyquinolato) aluminum-based organic light-emitting diodes doped with fluorescent dyes

作者：Chen P^*; Lei Y L; Song Q L; Zhang Y; Liu R; Zhang Q M; Xiong Z H

来源：Applied Physics Letters, 2009, 95(21): 213304.

DOI：10.1063/1.3266844

• dyes
• electroluminescent devices
• energy gap
• excitons
• magnetic field effects
• organic light emitting diodes
• organic semiconductors
• triplet state

The influences of fluorescent dye doping on the magnetoelectroluminescence in tris (8-hydroxyquinolato) aluminum (Alq(3))-based organic light-emitting diodes have been investigated systematically by varying the dopant concentrations and its energy band gap. Our results show that the decrease in electroluminescence intensity at high magnetic field, which survives only at low temperatures for pure Alq(3)-based devices, persists in dye-doped devices even at room temperature. This is explained here as the result of magnetic field dependent triplet-triplet annihilation process, in which the triplet excitons trapped on the dye molecules play the most important role.

• 出版日期2009-11-23
• 单位东南大学