Singlet - Singlet Annihilation in Multichromophoric Peryleneimide Dendrimers, Determined by Fluorescence Upconversion

To gain better control over the distribution ofchromophores and their interaction in the excited state, it isdesirable to have them distributed on a spherical surface.Recently, this goal has been achieved with the synthesis of aseries of first-generation peryleneimide dendrimers with a rigidtetrahedral central core, as shown in Scheme 1.