Journal
CHEMPHYSCHEM
Volume 16, Issue 3, Pages 640-648Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201402695
Keywords
coronene; luminescence reabsorption; phosphorescence; triphenylene; triplet-triplet absorption
Funding
- FCT, Portugal [PTDC/QUI-QUI/123162/2010, RECI/CTM-POL/0342/2012]
- Fundação para a Ciência e a Tecnologia [PTDC/QUI-QUI/123162/2010] Funding Source: FCT
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The luminescence decay of a species in an absorbing medium whose optical thickness changes with time, as occurs with triplet-triplet absorption following excitation cut-off, is studied theoretically and experimentally. A general luminescence decay function based on a distribution of optical thicknesses is presented. A simple decay function previously used empirically is shown to result from an exponential distribution of optical thicknesses. The general approach introduced allows the adequate description of the phosphorescence decays of two polycyclic aromatic hydrocarbons, coronene and triphenylene (normal and perdeuterated forms for both molecules), in polymer films in the presence of excited-state absorption.
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