scholarly journals Study the spectroscopic characteristics of Rhodamine B Dye in Ethanol and Methanol mixture and Calculation the Quantum Efficiency

2012 ◽  
Vol 9 (2) ◽  
pp. 352-358 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Quantum Efficiency ◽  
Rhodamine B ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Energy Levels ◽  
Solvent Polarity ◽  
Wave Number ◽  
Absorption And Fluorescence Spectra ◽  
Spectroscopic Characteristics ◽  
Rhodamine B Dye

The effect of ethanol and methanol solvent, and their mixture has been studied on the absorption and fluorescence spectra of laser dye Rhodamine B at concentration of (10-4) Molar at room temperature. The molar absorption coefficient has been determined for mixture which was (3.223) at wave number (18181.8 cm-1), Also the Quantum Efficiency of the two solvents (ethanol and methanol) and their mixture have been calculated ,which was for mixture spectrum (38.94%) and it was larger comparing with other and solvents. The characteristics of spectrum has been determined by calculating (??) of absorption spectrum for the solvents and its mixture at maximum wave number ( ) cm-1 depending on solvent polarity and the transitions between molecular energy levels in each solvent of Rhodamine B dye .

scholarly journals Spectral Properties of Hybrid of Rhodamine (6G) Dyes Doped Epoxy Resin Dissolved in Chloroform

2019 ◽  
Vol 16 (3(Suppl.)) ◽  
pp. 0764 ◽  
Author(s):  
Al-Hamdani Et al.
Keyword(s):  
Epoxy Resin ◽  
Quantum Efficiency ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Rhodamine 6G ◽  
Energy Gap ◽  
Radiative Lifetime ◽  
Stokes Shift ◽  
Fluorescence Emission ◽  
Absorption And Fluorescence Spectra

            The research is dealing with the absorption and fluorescence spectra for the hybrid of  an Epoxy Resin doped with organic dye Rhodamine (R6G) of different concentrations (5*10-6, 5*10-5, 1*10-5, 1*10-4, 5*10-4) Mol/ℓ at room temperature. The Quantum efficiency Qfm, the rate of fluorescence emission Kfm (s-1), the non-radiative lifetime τfm (s), fluorescence lifetime τf and the Stokes shift were calculated. Also the energy gap (Eg) for each dye concentration was evaluated. The results showed that the maximum quantum efficiency 62 % and maximum stokes shift 96 nm was obtained in dye concentration 5*10-6 and 1*10-4. The energy gap ranges between 1.066 eV to 1.128 eV depending proportionally on the dye concentrations.

scholarly journals A study of the solvent effect on the low temperature spectra of benzoanthracene molecules

2019 ◽  
Vol 12 (24) ◽  
pp. 1-9
Author(s):  
Asmaa N. Ahmed
Keyword(s):  
Solvent Effect ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Emission Cross Section ◽  
Solvent Polarity ◽  
Liquid Nitrogen Temperature ◽  
Absorption And Fluorescence Spectra ◽  
Nonpolar Solvents ◽  
Temperature Spectra ◽  
Peak Emission

been taken at room temperature down to liquid nitrogen temperature (77K). Polar and nonpolar solvents have been used to study the solvent effect on the absorption and fluorescence spectra of solute molecules. Some of the spectroscopic parameters have been determined as functions of solvent polarity and temperature. The results indicate that the band width FWHM increases with increasing the solvent polarity and temperature, while the peak emission cross section decreases with increasing of solvent polarity and decreases with increasing the temperatures. Clear vibrational structure spectra of benzoanthracene molecules have been observed in Nonane and Hexane solvents at 77K.

Fluorescence Spectra and Determination of the Energy of O-O Transitions of Coumarins in Liquid Solutions

1990 ◽  
Vol 45 (5) ◽  
pp. 618-622 ◽  
Author(s):  
A. Bączyński ◽  
P. Targowski ◽  
B. Ziętek ◽  
D. Radomska
Keyword(s):  
Fluorescence Spectra ◽  
Room Temperature ◽  
Optical Transition ◽  
Solvent System ◽  
Absorption And Fluorescence Spectra ◽  
Initial State ◽  
Liquid Solutions ◽  
Analytical Expressions ◽  
Electronic Transition Energies

Abstract Analytical expressions of absorption and fluorescence spectra of some coumarins in ethyl alcohol at room temperature are given. Satisfactory agreement of measured and calculated spectra is obtained. It was possible to obtain the pure electronic transition energies immediately after excitation (from absorption spectra) and after the thermal and orientational equilibrium is reached (from fluorescence). An optical transition carries a dye-solvent system to a state in which the mutual interaction energy is larger than in the initial state

Highly sensitive detection of CB[7] based on fluorescence resonance energy transfer between RhB and gold nanoparticles

2019 ◽  
Vol 16 ◽  
Author(s):  
Yan Zeng ◽  
Qikun Shi ◽  
Xiran Yang ◽  
Sobhan Chatterjee ◽  
Zaosheng Lv ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Rhodamine B ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Macrocyclic Compounds ◽  
Highly Sensitive ◽  
Visible Spectra ◽  
Highly Sensitive Detection

Background: Cucurbit[n]uril (CB[n], n=5, 6, 7, 8 and 10）is a type of macrocyclic compounds formed by n glycerol units and 2n methylene. The different size of the cavity led the different chemical characteristics of CB[n]. Therefore, it was very important to distinguish and detect CB[n]. Methods: At room temperature, Rhodamine B was added with gold nanoparticles solution. The above mixture was respectively mixed with different concentrations of Cucurbituril [n] or β-cyclodextrin solutions. The fluorescence spectra and ultraviolet-visible spectra of samples were determined. Results: It was found that 1.2nM gold nanoparticles could quench the fluorescence of 1μM Rhodamine B completely. After adding a certain amount of Cucurbituril[7], the fluorescence intensity of Rhodamine B was restored. Compared with other macrocyclic compounds, such as Cucurbituril[5], Cucurbituril[6] and β-cyclodextrin, we found that this method had unique selectivity for Cucurbituril[7]. Under the optimal conditions, the fluorescence recovery efficiency was linearly proportional to the concentration of Cucurbituril[7] in the range of 0.8-8 μg·mL-1. The detection limit was 0.21 μg·mL-1. Conclusion: We have established an effective and practical FRET-based detection method for CB[7] with RhB as donor and the gold nanoparticles as the acceptor. The system has unique and extensively selectivity for CB[7].

Sign in / Sign up

Export Citation Format

Share Document