Up to the 1970 decade the polymeric materials were explored only as insulating materials. Since the discovery of the high conductivity in polyacetilene doped with iodine, the polymeric materials become considered to fabricate electronic and opto-electronic devices. The main advantage of the polymeric material in comparison with the inorganic semiconductors it is the solubility, which enables simplest and low cost fabrication of devices by printing and coating techniques. In the field of light-emitting devices, at the ends of the 1980 decade, was reported the fabrication of the first light-emitting diode comprising a polymeric semiconductor. In 2007 was reported the fabrication of the first light-emitting device based on a light-emitting organic/inorganic composite, comprising inorganic micrometric light-emitting powder and a doped semiconductor polymer. In the field of solution processed light-emitting devices, only the devices fabricated with composites are in commercial stage, with main application in lighting and visual communication systems. Although the materials to fabricate this class of devices, and the devices, has already been traded, the materials physical properties and devices operational mechanisms were weakly studied. In this context, the present project has as main objective the study of operational mechanisms of this class of devices, with focus on the active material electroluminescence processes, which it is unexplored in the scientific literature.
News published in Agência FAPESP Newsletter about the scholarship: