Fabrication of self-assembled multilayer heterostructure of poly(p-phenylene vinylene) and its use for an electroluminescent diode

Abstract

Multilayerheterostructurethin films of electroactive polymers such as poly(p‐phenylene vinylene) (PPV)‐precursor and sulfonated polyaniline (SPAn) have been successfully fabricated via a process based on the spontaneous self‐assembly of conjugated polyion on a substrate. We have prepared SPAn‖PPV multilayerheterostructure light‐emitting diodes(LEDs) using this electrostatic self‐assembly technique and discussed the electroluminescent (EL) properties. The SPAn‖PPV monolayerLED emits greenish‐yellow light, but the SPAn‖PPV multilayer emits bluish‐green light and there is a slight shift between the two spectra of these devices. These results can be interpreted in terms of the confinement effect of carriers in the superlattice structure consisting of a SPAn‖PPV multilayer system.