Role of CsF on electron injection into a conjugated polymer

We studied electron injection from Al and Au cathodes into the conjugated polymer poly[2-methoxy,5-(2-ethylhexoxy)-1,4-phenylene vinylene] (MEH-PPV). When a thin CsF layer is inserted between MEH-PPV and Al, a substantial enhancement in electron injection is observed. Insertion of the same layer between MEH-PPV and Au does not have a similar effect, indicating that the enhancement mechanism is specific to CsF and Al. Thin Cs layers enhance electron injection regardless of the cathode metal. A mechanism that explains these observations is proposed. © 2000 American Institute of Physics

Light emitting diodes based on a liquid-crystalline oxadiazole derivative

Materials that can simultaneously act as liquid crystals, charge transport agents and emitters are of interest for potential applications in organic light emitting diodes. We report on the fabrication and characterization of single and multilayer diodes from a liquid crystalline oxadiazole derivative in a standard device configuration. Epitaxial deposition was used to produce oriented layers that led to devices with improved electrical properties