Abstract
IT is commonly assumed that the emission spectrum of the delayed fluorescence of an organic material is identical with that of the prompt fluorescence, because the two spectra arise from a radiative transition between the same two electronic levels, although the origin of the excitation differs. Recently a difference has been reported between the prompt and delayed fluorescence spectra of fluorescein in boric acid1,2 and of trypaflavin in polymethyl methacrylate3. Three possible causes of the phenomenon have been suggested2: (1) the possible existence of two metastable (triplet) levels, T1 and T2, in some molecules; (2) intermolecular migration of the triplet excitation energy; and (3) a possible difference in the transition probability distribution for prompt and delayed fluorescence.
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References
Pohoski, R., Bull. Acad. Polon. Sci. Ser. Sci. Math. Astron. Phys., 10, 505 (1962).
Grzywacz, J., and Pohoski, R., Z. Naturfarsch., 19 a, 440 (1964).
Kawski, A., Z. Naturforsch., 20 a, 1734 (1965).
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GRZYWACZ, J. Difference between Prompt and Delayed Fluorescence Spectra. Nature 213, 385–386 (1967). https://doi.org/10.1038/213385a0
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DOI: https://doi.org/10.1038/213385a0
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