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Keywords:

  • aggregation;
  • excimer;
  • fluorenone;
  • oxidative degradation;
  • polyfluorene
Thumbnail image of graphical abstract

Polyfluorenes, whilst attractive candidates for polymer light-emitting diodes, are susceptible to oxidative degradation. This degradation results in significant green emission. Although it has been linked to the formation of fluorenones, the precise relationship between fluorenones and the observed color shift remains widely debated. On page 2147, Chan et al. report a study on this relationship with the use of a series of model compounds. Inter-molecular fluorenone–fluorenone interaction is reported to be an essential requirement for the color shift.