Triplet Excitation Transfer Studies in Organic Condensed Matter via Cooperative Effects

Part of the NATO ASI Series book series (NSSB, volume 114)


The fundamental elementary excitations of most molecular organic condensed matter are the Frenkel excitons, neutral excited states which transport electronic excitation energy without transport of charge. Of special interest are the metastable paramagnetic triplet excitations which are known to travel during their lifetime over macroscopic distances. These excitations exhibit cooperative effects, notably triplet-triplet pair annihilation which leads to the creation of a higher energy singlet and to the emission of detectable delayed fluorescence. The scope of this presentation is to show how this mutual annihilation process can be put to use to extract information on the transport of the excitation energy. The advantage of such approach is that the migrating exciton itself is thus used as a probe to detect the excitation motion in the crystal. A direct technique using a spatially inhomogeneous, periodic, excitation of the crystal will be described and it will be shown how diffusion constants and coherence effects can be extracted from the delayed fluorescence data.


Delayed Fluorescence Exciton Band Triplet Exciton Frenkel Exciton Transport Length 
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Copyright information

© Plenum Press, New York 1984

Authors and Affiliations

  • V. Ern
    • 1
  1. 1.Laboratoire de Spectoscopie, Associé au CNRSUniversité Louis PasteurStrasbourgFrance

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