Efficient hybrid organic-inorganic light emitting diodes with self-assembled dipole molecule deposited metal oxides

摘要

We investigate the effect of self-assembled dipole molecules u0002SADMsu0003 on ZnO surface in hybridnorganic-inorganic polymeric light-emitting diodes u0002HyPLEDsu0003. Despite the SADM being extremelynthin, the magnitude and orientation of SADM dipole moment effectively influenced the worknfunction of the ZnO. As a consequence, the charge injection barrier between the conduction bandnof the ZnO and the lowest unoccupied molecular orbital of polyu00029,9u0002-dioctylfluoreneu0003-nco-benzothiadiazole could be efficiently controlled resulting that electron injection efficiency isnremarkably enhanced. The HyPLEDs modified with a negative dipolar SADM exhibited enhancedndevice performances, which correspond to approximately a fourfold compared to those ofnunmodified HyPLEDs. © 2010 American Institute of Physics. u0004doi:10.1063/1.3453759