Keywords : Xanthene dyes
Engineering and Technology Journal,
2012, Volume 30, Issue 12, Pages 2102-2115
The spectral properties (absorption and fluorescence) of laser dyes (R6G& R B)
mixture have been studied; this type of laser dye belongs to the Xanthenes family,
and has been dissolved in chloroform to prepare (1*10-5, 2*10-5, 5*10-5, 7*10-5, 1*10-4
M) at room temperature.
The achieved results pointed out to an increase in the absorption and fluorescence
intensities with the increased concentration which are found in agreement with Beer –
Lambert law. These results have been also showed an expansion in the spectral range
of absorption and fluorescence with a noticed shift in the direction of longer
The quantum efficiency of the dissolved Rhodamine mixture in chloroform has
been calculated by using the same above concentration (96%, 91%, 80%, 71%, and
66%) respectively. The radiative life time ( 0.21 , 0.41,0.89,1.19 and 1.48 ) ns and
fluorescent life time (0.20 , 0.37,0.71,0.84, and 0.97 ) ns respectively .
It has been determined that the resulting overlap between the absorption spectrum and
fluorescence spectrum for(R 6G&RB) mixture is more than that shown for the every
dye alone solution, therefore stock shift will be more.