IDevice Icon Objectives


  • Light emission in the OLED arises from recombination (electron transfer ) reactions of cation and anion radical of conjugated aromatic molecules.
  • The Jablonski diagram is used to describe the energy (wavelength) of absorbance and luminescence for aromatic molecules.
  • The color of absorption and emission in simple molecular systems is controlled by the structure of the molecule and by the degree of conjugation in the aromatic system.
  • The ratio of singlet state to triplet state formation helps to determine the OLED efficiency.
  • Small molecules are used in electrogenerated chemiluminescence (ECL) studies to help elucidate these light emitting processes in “condensed phases”

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