Geometric versus energetic competition in light harvesting by dendrimers

A property, unique to the treelike structure of dendrimers, is predicted. We show that for ideal dendrimers, with a superimposed energy funnel descending from the periphery to the center, one should be able to control the preferred location of the excitation by monitoring the temperature relative to the energy funnel. This opens the possibility for a controlled drive of photochemical processes in these supermolecules.