Abstract
Fluorescence from upper excited states is surveyed as a milestone for future works. The mechanisms of the occurrence of such anomalous fluorescence are classified. The chemical species treated in the present review are aromatic molecules and linear polyenes in the papers reported up to 2013. Information on the fluorescence properties reported so far in numerous papers allows generalizations of the mechanism of the appearance of fluorescence from upper excited states. There are three intramolecular mechanisms for the occurrence of fluorescence from upper excited states for aromatic molecules and liner polyenes. That is, the fluorescence from the upper state occurs; (i) through thermal population from the lower excited state, S1; (ii) through reverse internal conversion from the lower singlet state under collision-free conditions (in this case the upper and lower singlet states are mixing); (iii) directly from the upper singlet state without involvement of the fluorescence component via reverse internal conversion from the lower singlet state, i. e., prompt fluorescence.
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Itoh, T. (2016). Intramolecular Mechanisms for the Occurrence of Fluorescence from Upper Excited States of Aromatic Molecules and Linear Polyenes. In: Geddes, C. (eds) Reviews in Fluorescence 2015. Reviews in Fluorescence, vol 8. Springer, Cham. https://doi.org/10.1007/978-3-319-24609-3_9
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