Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Rhodamine

Spectral and Third Non-Linear Properties for Mixture Solutions of (R6G,RB, and RC) Dyes

Ali H. AL-Hamdani; Alaa H. Ali; Mariam H. Mohamed

Engineering and Technology Journal, 2015, Volume 33, Issue 1, Pages 273-284

In this research, the spectral characteristics and the nonlinear optical properties for the mixing of Rhodamine dyes (Rh6G, RC, and RB) were determined at different concentrations ( 1×10-5,2×10-5,5×10-5,7×10-5, and 1×10-4 mole/L) at room temperature. The spectral characteristics were studied by recording their absorption and fluorescence spectra. The intensity of absorption increased and fluorescence decreased when increasing concentration which in agreement with Beer – Lambert Law. It was observed that this mixing had a wide spectral range. The quantum efficiency decreased while the radiative life time and the fluorescence life time increased when increasing the concentration. Nonlinear optical properties were measured by using Z-Scan technique, using (CW) continuous Nd: YAG laser with frequency doubled wavelength (532nm) with output power (100 mW). The obtained nonlinear properties results of the mixture (R6G, RC, and RB) showed a negative nonlinear refractive index for concentrations (7×10-5, and 1×10-4 mole/L ) while the concentrations (1×10-5,2×10-5, and 5×10-5 mole/L ) showed a positive nonlinear refractive index, also this mixing showed two photon absorption behavior for all concentrations. The origin of optical nonlinearity in the dye may be attributed to laser-heating induced nonlinear effect.

Optical Spectral Study of Rhodamine Dyes Mixture Solution in Chloroform

Slafa Ismael Ibrahim; Majid Hameed Abdulmajeed

Engineering and Technology Journal, 2013, Volume 31, Issue 4, Pages 436-447

The spectral properties (absorption and fluorescence) of laser dyes (Rhodamine6G, Rhodamine 3GO and Rhodamine B) mixture have been studied. This type of laser dye belongs to the Xanthenes family, it has dissolved in chloroform to prepare (1*10-5 M) in different ratio such as (1R6G:1R3GO:1RB, 2R6G:1R3GO:1RB, 3R6G:1R3GO:1RB, 4R6G:1R3GO:1RB, 1R6G:2R3GO:1RB, 1R6G:3R3GO:1RB, 1R6G:4R3GO:1RB, 1R6G:1R3GO:2RB, 1R6G:1R3GO:3RB, and 1R6G:1R3GO:4RB) at room temperature.
The quantum efficiency of the dissolved Rhodamine in chloroform has been computed by using the above ratio and their results are as follows (89%,92%, 93%,95%,92%,93%,94%,84%,84%,and 84%) respectively.
The Radiative lifetime have been computed as given
(0.188,0.19,0.203,0.209,0.198,0.196,0.201,0.191,0.207,and0.219ns)respectively. Fluorescence lifetime have been also computed as given
(0.167,0.174,0.189,0.198,0.182,0.183,0.189,0.160,0.174,and0.184ns) respectively.

A Study of the Spectral Properties of Rhodamine (6G&B) DyesMixture Dissolved in Chloroform

Slafa I. Ibrahim

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.

Expermential Study of the Performance of Fluorescence Collector

Hussein A. Hadi; Saad T. Hamidi; Ali A. Abdulminaem

Engineering and Technology Journal, 2012, Volume 30, Issue 4, Pages 591-604

The luminescent concentrator which used consisting of organic fluorescence dyes
such as Rhodamine 6G doped in article Polyvinyl alcohol (PVA) to configure a
specific membrane thickness, and then put these films on the glass plate solar collector
model with energy halogen Lamp (1000 Watt) as a source of light to represent of
fluorescence collector.
Examining the effect of these pigments on the efficiency of the solar collector as a
function of the temperature difference between the water inside and outside of the solar
collector. Where the increasing in the amount of the difference between the
temperature refers to increasing the efficiency of the performance of solar collector.
Results showed that the efficient performance of the solar collector increases with the
increase in the intensity of incident light with existence the luminescent concentrator
,where the rising water temperature of (24 K) compared with (20 K) when there is not
existence the luminescent concentrator when the intensity of radiation falling (1500
W/m2) and increasing efficiency of solar collector to 20% .