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

A new model for analyzing the photophysics of polymer aggregates is introduced taking into
account exciton motion along a polymer chain and across polymer chains. Excitonic …

Using a single-mode Holstein Hamiltonian with through-space excitonic couplings
evaluated quantum mechanically, the absorption, circular dichroism, and …

A novel mechanism for J-and H-aggregate formation is presented on the basis of wave
function overlap (WFO) coupling between neighboring chromophores which supplements …

The ratio of the 0-0 to 0-1 peak intensities in the photoluminescence (PL) spectrum of red-
phase poly [2-methoxy-5-(2-ethylhexyloxy)-1, 4-phenylenevinylene], better known as MEH …

We present a quantum dynamical study of exciton transfer across a torsional defect that
locally breaks the π-conjugation in an oligo-(p-phenylene vinylene)(OPV) fragment. A site …

With the perspective of future vibronic studies, ab initio calculations of the energies of
vibrational relaxation that follows the processes of singlet or triplet excitation, and positive or …

We have experimentally determined the momentum dependence of the electronic excitation
spectra of para-quaterphenyl single crystals. The parallel arrangement of para-quaterphenyl …

Ultrafast dynamics of excitons in organic semiconductors is essential for a deep
understanding of the working mechanism of plastic opto-electronic devices. In this work …

Singlet exciton fission in pentacene is commonly described in terms of the dimer model,
containing some adjustable parameters that implicitly account for the influence of the …