Optical absorption and energy transport in compact dendrimers with unsymmetrical branching

Exciton localization-delocalization transition in an extended dendrimer

“…Let |r stand for the first excited state of the rth two-level system and¯ω 0 the corresponding energy. The set of orthogonal vectors {|r } defines a local basis that entirely generates the one-exciton Hilbert space E. Within this basis, the exciton dynamics is governed by a tight-binding Hamiltonian written as [31][32][33][34][35][36][37][38] …”

“…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.…”

Electronic energy transfer on a vibronically coupled quantum aggregate

“…The problem of the time dependence and character of electronic excitation transport ͑EET͒ along aggregates of atoms, molecules, or other monomeric quantum objects is enjoying renewed interest in the light of refined experimental, device fabrication, and molecular manipulation techniques. Apart from traditional quantum aggregates, such as those composed of organic molecules, e.g., crystals, [1][2][3][4] dendrimers, 5 J-aggregates, 6 photosynthetic units, [7][8][9][10][11] new types of aggregate, such as cold atom [12][13][14] or quantum dot assemblies, 15 mixed aggregates of metal nanoparticles, and organic molecules, 16 are being studied. New, more sophisticated probing and detection techniques allow studies on EET with increasing spatial and temporal resolutions.…”

Disorder-enhanced exciton delocalization in an extended dendrimer

“…The connectivity of the branching points is equal to three so that D58 has a threefold symmetry around its central core. It consists of three dendrons The phenyl rings define sites for a network model that describes the dynamics of Frenkel excitons [5][6][7][8][9][10][11][12] . Each site x = 1, ..., N is occupied by a two-level system that accounts for the electronic properties of a phenyl ring.…”

“…In that context, it has been suggested that excitonmediated energy transport could be exploited to design artificial light-harvesting complexes [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] . The main idea consists in the functionalization of the terminal groups by chromophores that favor light harvesting.…”