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Optical spectroscopy of single pentacene molecules in an ordered and a disordered p-terphenyl crystal

✍ Scribed by Th. Basché; S. Kummer; C. Bräuchle

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 735 KB
Volume: 225
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(94)00613-x

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✦ Synopsis

We investigated pentacenedoped pterphenyl crystals with different degrees of disorder as evidenced by the inhomogeneous broadening of the O,-site distribution. Single pentacene molecules were detected in the wings of 0, by fluorescence excitation spectroscopy. The ISC rates for a number of single molecules were determined by measuring the intensity correlation function of the fluorescence photons. We found a dramatic dependence of the distribution of ISC rates on the crystal disorder. The fully saturated fluorescence emission rates as calculated using the ISC rates were found to be consistent with the experimentally measured photocount rates.

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