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Keywords:

  • light-emitting diodes;
  • polyfluorenes;
  • polymers;
  • built-in potential;
  • electroabsorption spectroscopy
Thumbnail image of graphical abstract

Energy level alignment in polyfluorene-based polymer light-emitting diodes (PLEDs) is studied with electroabsorption spectroscopy and cyclic voltammetry (CV). Using an active layer containing a blend of three polyfluorenes, it is found that the built-in potential values are determined by the interplay of the contacts' work function and the lowest and highest lying energy levels of the blend components.