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Spectroscopic investigations of dithienyl polyenes
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Paper Abstract

To understand the photophysics of nonlinear absorbers, we have investigated the photophysics of a series of di(2- thienyl-3,3',4,4'-butyl)polyenes. Spectroscopic measurements, including UV/Vis, fluorescence, fluorescence lifetimes, fluorescence quantum yields, triplet state lifetime, solvent effects and two-photon absorption coefficient were obtained as a function of the number of double bonds (n equals 1 - 5). Trends in the data reflected the ordering, energy gap between and mixing of 1Bu* and 1Ag* excited state configurations. We investigated the solvatochromism of a series of (alpha) ,(omega) -di(2- dithienyl 3,3',4,4'-butyl) polyenes. Absorption (n equals 1 - 5 double bonds) were collected in a series of aprotic solvents. The absorption energy dispersion effect sensitivity increased smoothly with n, reaching asymptotic behavior as n approached 5. The emission energy had less solvent sensitivity, giving evidence for a polar 1Bu* absorbing state and a nonpolar 1Ag* emitting state. We observed sensitivity of the absorbing and emitting states to solute-solvent dipole-dipole interactions, suggesting the dithienyl polyenes had a polar syn ground state conformation.

Paper Details

Date Published: 4 October 1999
PDF: 10 pages
Proc. SPIE 3798, Power-Limiting Materials and Devices, (4 October 1999); doi: 10.1117/12.363877
Show Author Affiliations
Thomas M. Cooper, Air Force Research Lab. (United States)
Laura A. Sowards, Air Force Research Lab. (United States)
Lalgudi V. Natarajan, Science Applications International Corp. (United States)
Sean M. Kirkpatrick, Science Applications International Corp. (United States)
Suresh Chandra, Science Applications International Corp. (United States)
Daniel G. McLean, Science Applications International Corp. (United States)
Charles W. Spangler, Montana State Univ./Bozeman (United States)

Published in SPIE Proceedings Vol. 3798:
Power-Limiting Materials and Devices
Christopher M. Lawson, Editor(s)

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