Conjugated graft copolymers consisting of a poly(3-hexylthiophene) (P3HT) backbone and poly(9,9 '-dioctylfluorene) side chains (PF) with different grafting degrees were synthesized by the CuAAC reaction. The properties of these materials were studied by UV-Vis and fluorescence spectroscopy. The former technique provides insight in their self-assembly, while the latter is used to study the energy funneling from the PF side chains to the P3HT backbone. (C) 2015 Wiley Periodicals, Inc.