Driving current and temperature dependent magnetic-field modulated electroluminescence in Alq(3)-based organic light emitting diode

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

来源：Organic Electronics, 2009, 10(5): 889-894.

DOI：10.1016/j.orgel.2009.04.016

• Electroluminescence
• Magnetic field effect
• TrA process
• Temperature dependence

Driving current and temperature dependences of magnetic-field modulated electroluminescence (EL) in tris(8-hydroxyquinoline) aluminum (Alq(3))-based OLEDs have been thoroughly investigated. At low temperatures, the applied magnetic-field induces a sharp increase of the EL in low field regime (B <= 35 mT) and a slow but apparent decrease at high fields (35 <= B <= 500 mT). The low-held increase in EL (LIFE) survives at all working temperatures while the high-held decrease (HFE) gradually disappears as temperature is increased. At a given temperature, the higher the current level, the smaller LIFE and stronger HFE are observed. To explain the observed MFEs a composite model based on magnetic-field dependent singlet-to-triplet conversion of electron-hole pairs and magnetic-field mediated triplet-triplet annihilation process is proposed in this paper.

• 出版日期2009-8
• 单位西南大学