Optical absorption in compact and extended dendrimers

Exciton localization-delocalization transition in an extended dendrimer

“…A dendrimer behaves as an artificial light-harvesting complex able to convert the energy of a radiation into a chemical fuel. [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] To proceed, the main idea consists in the functionalization of the terminal groups by chromophores that are responsible for light harvesting. The capture of light generates electronic excitons that propagate along the dendrons.…”

Optical absorption in dendrimers

“…For more details on parameters see Ref. [4]. The lowest absorption peak is redshifted with increasing dendrimer size.…”

“…This redshift results from a growing exciton delocalization in the lowest eigenstate with dendrimer size. The DOS shows [4] that the strongest absorption peak stems mainly from the molecular units at the periphery of the dendrimer.…”

“…Now we allow for absorption not only at branching points, but also within the linear chains connecting them [4]. The optical transition dipoles are again assumed to be directed along the chemical bonds.…”

Influence of geometry on light harvesting in dendrimeric systems. II. nth-nearest neighbor effects and the onset of percolation

“…In addition to the above-cited contributions of Klafter et al [1][2][3] already cited, we also wish to mention the important work of Supritz et al [38] who developed a theory in which energy transport in dendrimers is described as the coupled coherent and incoherent motion of excitons. In our approach, we proceed by representing the dendrimer as a set of discrete, connected lattice points, and develop a stochastic theory for particle diffusion.…”