Increase of electroluminescent intensity in planar light-emitting diode structures based on PFO polymer – ZnO nanoparticles composite films operated by alternating-current voltages

• Solution processed planar light-emitting diode structures based on PFO polymer and ZnO nanoparticles composite films are developed.
• An increase of electroluminescent intensity in such planar PFO:ZnO diode structures operated by alternating-current with respect to that operated by direct current voltages is found.
• An increase of frequency up to 30 kHz results in increase of electroluminescent intensity by a factor of ~30.
• Applying of AC voltage is effective tool in producing strong EL emission in planar composite light-emitting structures.

We report on the considerable increase of electroluminescent (EL) intensity in planar organic light-emitting diode structures based on semiconducting polymer PFO and ZnO nanoparticles composite films operated by alternating-current (AC) voltages with respect to that operated by direct current. It was established that an increase of frequency from 0 to 30 kHz results in increase of EL intensity of such structures by a factor of ~30. The EL emission takes place at positive AC bias and the EL spectral range is the same as that for the photoluminescent emission spectrum for the same sample. It was shown that applying AC voltage is effective tool in producing strong EL emission in planar composite light-emitting structures.