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Dye Mixtures for Ultrafast Wavelength Shifters

Published online by Cambridge University Press:  21 February 2011

S. Cangopadhyay ,
N. Barashkov ,
L. Liu ,
C. Palsule ,
W. Borst  and
R. Wigmans
S. Cangopadhyay
Affiliation:
Dept. of Physics, Texas Tech University, Lubbock, Tx 79409
N. Barashkov
Affiliation:
Karpov Institute of Physical Chemistry, Obukha Street, 10, Moscow, Russia 103064
L. Liu
Affiliation:
Dept. of Physics, Texas Tech University, Lubbock, Tx 79409
C. Palsule
Affiliation:
Dept. of Physics, Texas Tech University, Lubbock, Tx 79409
W. Borst
Affiliation:
Dept. of Physics, Texas Tech University, Lubbock, Tx 79409
R. Wigmans
Affiliation:
Dept. of Physics, Texas Tech University, Lubbock, Tx 79409
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Abstract

We have produced fast wavelength shifters using mixtures of various Coumarin dyes with DCM in epoxy-polymers (DGEBA+HHPA) and measured the properties of these wavelength shifters. The particular mixtures were chosen because there is a substantial overlap between the emission spectrum of Coumarin and the absorption spectrum of DCM. The continuous wave and time-resolved fluorescence spectra have been studied as a function of component concentration to optimize the decay times, emission peaks and quantum yields. The mean decay times of these mixtures are in the range of 2.5-4.5 ns. The mean decay time increases with an increase in Coumarin concentration at a fixed DCM concentration or with a decrease in DCM concentration at a fixed Coumarin concentration. This indicates that the energy transfer is radiative at lower relative DCM concentrations and becomes non-radiative at higher DCM concentrations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 348 , 1994 , 181
Copyright
Copyright © Materials Research Society 1994

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References

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