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Keywords:

  • organic electronics;
  • perylenetetracarboxylic dianhydride;
  • structure–property relationships
Thumbnail image of graphical abstract

The effect of crystalline order on the exciton diffusion length (LD) is shown for the archetypal organic semiconductor 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA; see figure). LD increases from ∼6.5 nm in the amorphous limit to ∼25 nm for single crystals. These changes in diffusion length are connected to changes in the fluorescence quantum yield, which is useful for understanding where crystal-size-dependant diffusion trends are likely to be observed for other organic materials.