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Keywords:

  • fluorescence spectroscopy;
  • nanotechnology;
  • photochromism;
  • scanning probe microscopy;
  • single-molecule studies
Thumbnail image of graphical abstract

Heterogeneous optical behavior of perylene polyisocyanides, which arises from different structures of the polymer backbone, is revealed by the combination of single-molecule fluorescence spectroscopy and atomic force microscopy. Short nonhelical perylene oligomers exhibit monomer-like fluorescence properties, whereas long helical perylene fiber emission arises from excimer sites after delocalization of the excitation along the polymer backbone (see picture).