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Proceedings Paper

Stimulated emission in sexithiophene single crystals
Author(s): Francis Garnier; Gilles Horowitz; Pierre Valat; Faycal Kouki; Veronique Wintgens
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Paper Abstract

Temperature dependent steady state and transient photoluminescence (PL) measurements were performed on sexithiophene single crystals. As the temperature is lowered, three different sets of equally spaced peaks appear on the steady state PL spectrum. This behavior is interpreted in the frame of the molecular exciton theory. The lowest energy set is attributed to transitions from the lower Au excited state, resulting from the Davydov splitting of the 1Bu excited state of the isolated molecules. The highest energy set of peaks is ascribed to an excited Ag level. At low excitation levels, the transient PL follows a single exponential decay, with a time constant of 1.8 ns. When the excitation energy is increased beyond to 35 (mu) J/cm2, a second much faster transient is superimposed, and the PL spectrum narrows to a single line, centered at the 0-1 transition of the low energy set of the steady PL spectrum. The width of the emission line is 13 cm-1. These observations are explained in terms of a stimulated emission process.

Paper Details

Date Published: 1 December 1997
PDF: 10 pages
Proc. SPIE 3145, Optical Probes of Conjugated Polymers, (1 December 1997); doi: 10.1117/12.295533
Show Author Affiliations
Francis Garnier, CNRS Lab. des Materiaux Moleculaires (France)
Gilles Horowitz, CNRS Lab. des Materiaux Moleculaires (France)
Pierre Valat, CNRS Lab. des Materiaux Moleculaires (France)
Faycal Kouki, CNRS Lab. des Materiaux Moleculaires (France)
Veronique Wintgens, CNRS Lab. des Materiaux Moleculaires (France)

Published in SPIE Proceedings Vol. 3145:
Optical Probes of Conjugated Polymers
Z. Valy Vardeny; Lewis J. Rothberg, Editor(s)

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