A study of the spectral properties of Rhodamine (6G & B)‎ dyes mixture dissolved in chloroform

الملخص EN

The spectral propertie s (absorption and fluorescence ) of laser dy es (R6G& R B) mixture have been studied; this ty pe of laser dy e 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 ac hieved results pointed out to an increase in the absorption and fluoresc ence intensities with the incre ased concentration which are found in agreement with Beer – Lambert law.

These results have been also showed an expansion in the spe ctral range of absorption and fluore scence with a notice d shift in the direction of longer wavelength.

The quantum efficiency of the dissolved Rhodamine mixture in chloroform has been calculated by using the same above c once ntration (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 spec trum and fluorescenc e spectrum for(R 6G&RB) mixture is more than that shown for the every dy e alone solution, therefor e stock shift will be more.