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 Studying the spectral properties of thin films of rhodamine (6G) dyes doped polymer (PMMA) dissolved in chloroform

2019 ◽  
Vol 12 (23) ◽  
pp. 59-64
Author(s):  
Ali H. Al-Hamdani
Keyword(s):  
Thin Films ◽  
Quantum Efficiency ◽  
Spectral Properties ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Rhodamine 6G ◽  
Composite Films ◽  
Peak Shift ◽  
Doped Polymer ◽  
Made In

              In the present work, poly methyl methacrylate (PMMA) doped with Rhodamine 6G was prepared. The spectral properties (absorption and fluorescence) of the films were studied at different concentrations (1x10-5, 2x10-5, 5x10-5, 7x10-5, and 1x10-4mol/l). The investigated samples were made in the form of thin films. This was achieved by dissolving a certain weight of PMMA in a fixed volume of chloroform, composite films was with thickness (25.8μm) at room temperature. The achieved results were pointed out that absorption and fluorescence spectra have taken a wide spectral rang so when increased the concentration each peak shift toward along wavelength. The quantum efficiency of the films were calculated as follows (98%,89%,84%,83% and 76%) for the above concentrations respectively. It has been noticed that the quantum efficiency decreases as the concentrations increases.

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 .

Development of temporal spectroscopic properties for Xerogel matrices doped with Rhodamine 6G dye

Open Physics ◽  
2006 ◽  
Vol 4 (3) ◽  
Author(s):  
Abbas Al-Wattar ◽  
Baha Chiad ◽  
Wesam Twej ◽  
Sarmed Al-Awadi
Keyword(s):  
Fluorescence Spectra ◽  
Rhodamine 6G ◽  
Sol Gel ◽  
Blue Shift ◽  
Spectroscopic Properties ◽  
Dye Molecules ◽  
Absorption And Fluorescence Spectra ◽  
Silica Network ◽  
Sol Gel Process ◽  
Two Parameters

AbstractThe solid host of a laser dye modifies its spectroscopic properties with respect to its liquid host. During the Sol-Gel process the dye molecules suffer from changing their environment. Two parameters affect this matter, the change in the concentration due to the evaporation of the solvent (drying) and the caging of dye molecules inside the pores or attachment to the silica network. Rhodamine 6G absorption and fluorescence spectra with different concentrations, during Sol-Gel time processing, have been studied. Both, absorption and fluorescence spectra of the dye in the solid host, for different concentrations, show a blue-shift relative to its liquid phase.

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

Investigation on the mechanism of ESIPT of 2-hydroxy-1-naphthaldehyde-(4-pyridinecarboxylic)-hydrazone and detection of Al3+ ion

2019 ◽  
Vol 97 (7) ◽  
pp. 721-725 ◽  
Author(s):  
Songsong Liu ◽  
Jie Pan ◽  
Dongmei Wei ◽  
Jihua Xu ◽  
Yong Zhou ◽  
...  
Keyword(s):  
Excited State ◽  
Fluorescence Spectra ◽  
Fluorescence Emission ◽  
Intramolecular Proton Transfer ◽  
Absorption And Fluorescence Spectra ◽  
Molecular Configuration ◽  
Photo Induced Electron Transfer ◽  
Reduced Density Gradient ◽  
State Changes ◽  
Reduced Density

The sensing mechanism of 2-hydroxy-1-naphthaldehyde-(4-pyridinecarboxylic)-hydrazone for Al3+ is investigated based on the excited-state intramolecular proton transfer (ESIPT) and photo-induced electron transfer (PET) processes. Absorption and fluorescence spectra are calculated, which are consistent with experimental results. By analyzing the major bond parameters, infrared vibrational spectra as well as frontier molecular orbitals, it can be concluded that the hydrogen bond is enhanced in the first singlet excited state (S1), which can also be visualized by the reduced density gradient function. Potential energy curves are also scanned, which can elucidate that the ESIPT process is more likely to occur in the S1 state. Changes in molecular configuration and intensity of fluorescence emission confirmed that the ESIPT and PET processes are forbidden in the presence of Al3+.

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.

New organic luminophores on the basis of cyano- and dicyanopyridines

1986 ◽  
Vol 51 (5) ◽  
pp. 1061-1070 ◽  
Author(s):  
Štefan Marchalín ◽  
Jan Fähnrich ◽  
Milan Popl ◽  
Josef Kuthan
Keyword(s):  
Solvent Effect ◽  
Fluorescence Spectra ◽  
Spectral Characteristics ◽  
Stokes Shift ◽  
Conformational Structure ◽  
Absorption And Fluorescence Spectra ◽  
Organic Luminophores ◽  
The Relationship ◽  
Derivatives Of

Absorption and fluorescence spectra of solutions of cyanopyridine derivatives of polyphenylene type, II-VIII, were investigated. The spectral characteristics determined are interpreted in relation to the probable conformational structure of the investigated substances in the states S0 and S1. The relationship between the Stokes shift and the solvent effect on the fluorescence spectra is discussed.

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