Abstract
Electroluminescent devices using Z-type Langmuir–Blodgett multilayer films of poly(hexaethyleneglycol-3″,4″-dihexyl-2,2′;5′,2″;5″,2″′;5″′,2″″-pentathiophene-5,5″″-dicarboxylate) (PPOE6) as the active region have been fabricated. The organic material was incorporated in a sandwich structure between indium tin oxide (ITO) and aluminium electrodes. Diode-like characteristics were observed, with a power law relationship between current and voltage indicative of charge injection at the contacts. It is thought that the recombination of electrons and holes (injected at the aluminium and ITO contacts, respectively) was responsible for the electroluminescent effect. The threshold voltage for the generation of yellow light (visible in a darkened room) was ca. 4 V. Using a calibrated photodiode to measure the optical output power, a quantum efficiency of the order of 1×10 −2% was calculated.
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