Optical Dielectric Properties of Thin Films Formed by Organic Dye Aggregates

Abstract

Molecular aggregates – the assemblies of dye molecules-possess distinct optical characteristics as compared to their constituent monomeric units. Strong resonant interactions between the molecular electronic transitions of the monomers result in an intense and narrow absorption band at a frequency that depends on the relative orientation of the monomers within the aggregates. The strong absorption bands of these materials makes them attractive for a range of optoelectronic applications. We review the experimental and computational work dedicated to the determination of the optical dielectric functions of molecular aggregates, with an outlook to applications in device engineering.