The electronic excited states of molecular aggregates and their photophysical signatures
have long fascinated spectroscopists and theoreticians alike since the advent of Frenkel …

J‐aggregates are of significant interest for organic materials conceived by supramolecular
approaches. Their discovery in the 1930s represents one of the most important milestones in …

Functional organic materials with enhanced two‐photon absorption lead to new
technologies in the fields of chemistry, biology, and photonics. In this article we review …

A series of highly soluble and fluorescent, at core tetraaryloxy-substituted and in imide
positions hydrogen atom containing perylene bisimide (PBI) dyes 1a− e with varying …

We investigate the origins of exceptionally long charge-carrier lifetimes of halide perovskites
by using temperature-dependent and time-resolved mid-infrared spectroscopy. We report …

Organic molecules store the energy of absorbed light in the form of charge-neutral molecular
excitations–Frenkel excitons. Usually, in amorphous organic materials, excitons are viewed …

▪ Abstract Recent experimental and theoretical investigations of excitons in conjugated
oligomer nanoaggregates, thin films, and crystals are reviewed. The review focuses on the …

The photoluminescence (PL) spectral line shape of regioregular poly (3-hexylthiophene)
thin films is analyzed using a model which treats the polymer π-stacks as H-aggregates with …

Exciton coherence in a J-aggregate with exciton− phonon coupling involving a single
intramolecular vibration is studied. For linear aggregates with no disorder and periodic …

Cycloparaphenylenes, the simplest structural unit of armchair carbon nanotubes, have
unique optoelectronic properties counterintuitive in the class of conjugated organic …