Title: Gaussian distributions of the decay times of the singlet excited-state of aromatic-amines dispersed in polymer-films
Authors: Verbeek, G ×
Vaes, A
Van der Auweraer, Mark
Deschryver, Fc
Geelen, C
Terrell, D
Demeutter, S #
Issue Date: Jan-1993
Publisher: Amer chemical soc
Series Title: Macromolecules vol:26 issue:3 pages:472-478
Abstract: The fluorescence maximum of amino-substituted 1,3,5-triphenylbenzenes dispersed in polystyrene and polycarbonate is shifted to longer wavelengths compared to isooctane, and this shift is larger in polycarbonate than in polystyrene. The shift is attributed to a partial relaxation of the matrix around the dispersed molecules during the excited-state lifetime. The nonexponential fluorescence decays obtained at different emission wavelengths can be analyzed globally assuming a Gaussian distribution of decay rates with a standard deviation that does not depend upon the emission wavelength. This Gaussian distribution of decay rates is attributed to a distribution of sites with different interaction with the polymer matrix. The sites giving the largest excited-state stabilization are characterized by the slowest average decay rate.
ISSN: 0024-9297
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
× corresponding author
# (joint) last author

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