Abstract
Luminescence spectra and decay curves of phenanthrene, anthracene and l-azaphenanthrene adsorbed on thermally pretreated alumina and thoria were recorded in the temperature range of 60 – 400 K. Intersystem-crossing (ISC) rate constants were estimated and discussed with respect to the heavy-atom effect and the type of bonding to the surface. The heavy-atom enhances the radiative and non-radiative T 1--->S O transition rates up to three powers of ten. The type of bonding only influences the thermal phosphorescence quenching rate. Its pre-expotential factor decreases by several orders of magnitude in the sequence dissolved in rigid media > physisorbed > π-complexed > σ-complexed.
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