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Lumineszenz und Energieleitung in organischen Molekülkristallen

  • H. C. Wolf
Chapter
Part of the Advances in Solid State Physics book series (ASSP, volume 4)

Abstract

It is the aim of this article to give a survey of the present state of our knowledge on fluorescence spectra and energy transfer processes in organic crystals, especially benzene, naphthalene and anthracene.

The most important crystal properties in the optical fluorescence spectra are the Davydovsplitting, the occurrence of crystalline (K-) and molecular (M-)series and so-called X-series. This X-fluorescence is a disturbed intrinsic fluorescence of the crystal. We have observed both impurities and imperfections as origins for this disturbance. There are no self-trapped excitons to be detected in the spectra.

Energy transfer processes in organic crystals can be described by an exciton diffusion mechanism (hopping model). Various calculations and experiments give values of 105–106 steps per lifetime for singulet—and 1010–1011 steps per lifetime for triplet excitons. The exciton diffusion in pure crystals does not need a measurable thermal activation.

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Copyright information

© Friedr. Vieweg & Sohn 1965

Authors and Affiliations

  • H. C. Wolf
    • 1
  1. 1.3. Physikalischen Institut der Technischen HochschuleStuttgart

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