The Exciton Model for Molecular Materials: Past, Present and Future?

Abstract

In assemblies of identical molecules or chromophores, electronic excitations can be described as excitons, bound electron‐hole pairs that can move from site to site as a pair in a coherent manner. The understanding of excitons is crucial when trying to engineer favorable photophysical properties through structuring organic molecular matter. In recent decades, limitations of the concept of an exciton have become clear. The exciton can hybridize with phonon and photons. To clarify these issues, the exciton is discussed within the broader context of the gauge properties of the electromagnetic force.

Chemoselective reaction of methoxyaminomethyl BODIPYs with unprotected carbohydrates: a powerful tool for accessing BODIPY neoglycosides

“…S85 in ESI†). According to the exciton model, 48 this spectral trend is indicative of H-type aggregation. Such aggregation should be a consequence of a weak exciton coupling, since its spectroscopic contribution arises as a shoulder of the main absorption band, even at the highest optical density (dye concentration around 2 mM for BODIPY conjugates 15 and 16 ) herein tested in pure water.…”