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

Abstract

How do chromophores interact when attached to the rim of a dendrimer? In order to approach this problem, a time-resolved fluorescence upconversion study with 250 fs resolution has been performed on a series of dendrimers, in which the number of chromophores varied between one and four. The dendrimers were first generation tetraphenylmethane core compounds, to which one to four peryleneimide chromophores were attached; four are shown colored red in 1. A very important process was found to be singlet–singlet annihilation taking place in the multichromophoric compounds.