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Keywords:

  • Conjugated polymers;
  • Förster transfer mechanism;
  • Fluorescence;
  • Polymer blends;
  • Polymeric materials;
  • Quantum efficiency;
  • Scanning near-field optical microscopy
Thumbnail image of graphical abstract

A conjugated polymer blend is studied by time-resolved scanning near-field optical microscopy. The blend undergoes strong phase separation on spin-casting. The fluorescence lifetime of the F8BT emission is strongly dependent on the relative phase in which it is located (see figure and cover). This effect is manifested by a significant concentration-dependent variation in the overall photoluminescence quantum efficiency of the film.