Efficient hybrid organic-inorganic light emitting diodes with self-assembled dipole molecule deposited metal oxides
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- Efficient hybrid organic-inorganic light emitting diodes with self-assembled dipole molecule deposited metal oxides
- Park, Ji Sun; Lee, Bo Ram; Lee, Ju Min; Kim, Ji-Seon; Kim, Sang Ouk; Song, Myoung Hoon
- Benzothiadiazoles; Charge injection barriers; Deposited metal; Device performance; Dipole molecules; Lowest unoccupied molecular orbital; Organic-inorganic; Polymeric light-emitting diodes; Self-assembled; ZnO; ZnO surface
- Issue Date
- AMER INST PHYSICS
- APPLIED PHYSICS LETTERS, v.96, no.24, pp.243306 -
- 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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