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

Ji Sun Park; Bo Ram Lee; Ju Min Lee; Ji-Seon Kim; Sang Ouk Kim; Myoung Hoon Song
June 2010
Applied Physics Letters;6/14/2010, Vol. 96 Issue 24, p243306
Academic Journal
We investigate the effect of self-assembled dipole molecules (SADMs) on ZnO surface in hybrid organic-inorganic polymeric light-emitting diodes (HyPLEDs). Despite the SADM being extremely thin, the magnitude and orientation of SADM dipole moment effectively influenced the work function of the ZnO. As a consequence, the charge injection barrier between the conduction band of the ZnO and the lowest unoccupied molecular orbital of poly(9,9′-dioctylfluorene)-co-benzothiadiazole could be efficiently controlled resulting that electron injection efficiency is remarkably enhanced. The HyPLEDs modified with a negative dipolar SADM exhibited enhanced device performances, which correspond to approximately a fourfold compared to those of unmodified HyPLEDs.


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