Investigation of the Fluorescence Spectra of the Fluorescent Dyes

2014 ◽  
Vol 936 ◽  
pp. 2007-2010
Author(s):  
Saksit Sukprasong ◽  
Tanabat Promjun ◽  
Komsanti Chokethawai ◽  
Athipong Ngamjarurojana
Keyword(s):  
Photon Energy ◽  
Fluorescence Spectra ◽  
Fluorescent Dyes ◽  
Laser Excitation ◽  
Laser Induced Fluorescence ◽  
Luminescence Decay ◽  
Blue Laser ◽  
Excitation Source ◽  
Luminescence Spectra ◽  
Fluorescence Dye

The experiment was conducted to study the effects of concentration, temperature and solvent on the luminescence decay curves obtained in laser-induced fluorescence (LIF) experiment from fluorescent orange dye. Sample solutions of fluorescence dye were prepared by mixing with ethanol solvents at different concentration. The sample was illuminated with a radiation of 470 nm using a blue laser excitation source. Luminescence spectra were recorded using a compact fiber coupled CCD spectrometer and the results were analyzed.The results showed that both concentration and temperature affected the luminescence decay of orange dye in the same way. The luminescence decay was decreased when the concentration and temperature were increased.The appearance of peak positions was slighly shifted to higher wavelength (lower photon energy) when concentration were varied. Then the results of concentration effect were analyzed using peak fit, the appearance of peak positions was slightly shifted from 601.51 to 604.12, 607.64, and 618.44 nm at the concentration of 50, 60, 70 and 80 % by volume, respectively.

scholarly journals Laser-Induced-Fluorescence Spectrum of the CNN Molecule

1988 ◽  
Vol 9 (4-6) ◽  
pp. 359-368 ◽  
Author(s):  
M. C. Curtis ◽  
A. P. Levick ◽  
P. J. Sarre
Keyword(s):  
Low Temperature ◽  
Gas Phase ◽  
Fluorescence Spectra ◽  
Laser Excitation ◽  
Band System ◽  
Laser Induced Fluorescence ◽  
Rotational Spectrum ◽  
Spin Orbit ◽  
Electronic Band ◽  
Temperature Matrix

We have recorded a laser excitation spectrum of the A3Π–X3Σ− electronic band system of the CNN radical in the gas phase, at a resolution of ca. 0.8 cm−1. The rotational branch structure of the vibrational band near 419 nm has been simulated and molecular parameters are obtained. The results are compared with data from laser-induced-fluorescence spectra of CNN trapped in a low-temperature matrix. A revised value for the spin-orbit parameter in the A3Π state is obtained and comparison is made with the values for related molecules. The possible detection of CNN in astrophysical sources is considered and the general features of its rotational spectrum in the ground electronic state are described.

Investigation of Optical Spectroscopic Properties on Fluorescent Creams

2016 ◽  
Vol 848 ◽  
pp. 72-75
Author(s):  
Saksit Sukprasong ◽  
Apichart Limpichaipanit ◽  
Athipong Ngamjarurojana
Keyword(s):  
Fiber Optics ◽  
Fluorescence Spectra ◽  
Laser Excitation ◽  
Color Space ◽  
Spectroscopic Properties ◽  
Laser Induced Fluorescence ◽  
Color Management ◽  
Fluorescence Technique ◽  
Uv Laser ◽  
Fluorescent Materials

The optical spectroscopic properties of fluorescent materials were investigated using laser induced fluorescence technique. The fluorescent creams were used in this research. The sample materials were illuminated by UV laser excitation source. Then, the fluorescence spectra were recorded and analyzed by fiber optics spectrometer complied with the CIE 1931 XYZ color space which is essential for color management. The result showed that the characteristics of fluorescence spectra such as intensity, wavelength position and bandwidth in each fluorescent creams exhibited distinct characteristics in each species.

Laser-Induced Fluorescence in Artwork Diagnostics: An Application in Pigment Analysis

1996 ◽  
Vol 50 (10) ◽  
pp. 1331-1334 ◽  
Author(s):  
Demetrios Anglos ◽  
Maria Solomidou ◽  
Ioanna Zergioti ◽  
Vassilis Zafiropulos ◽  
Theodore G. Papazoglou ◽  
...  
Keyword(s):  
Cadmium Selenide ◽  
Fluorescence Spectra ◽  
Laser Excitation ◽  
Fluorescence Emission ◽  
Laser Induced Fluorescence ◽  
Future Prospects ◽  
Oil Painting ◽  
Pigment Analysis ◽  
Analytical Technique ◽  
Lif Spectroscopy

The applicability of laser-induced fluorescence (LIF) spectroscopy as a nondestructive analytical technique for artwork diagnostics is investigated. In this work, LIF is employed in the examination of a set of cadmium sulfide- and cadmium selenide sulfide-based pigments in a series of oil painting test samples. Fluorescence spectra of the oil colors are recorded upon pulsed laser excitation at 532, 355 (Nd:YAG), and 248 nm (KrF excimer). The technique is shown to be suitable for differentiating among the various cadmium pigments used in this study and, furthermore, to be capable of identifying individual components in mixtures of these pigments on the basis of their characteristic fluorescence emission. Future prospects and the potential for the extension of LIF from a research laboratory technique into a conservator's tool for artwork diagnostics are discussed.

Effects of UV-B Radiation on Laser-Induced Fluorescence Spectra in Crop Leaves

2001 ◽  
Vol 22 (2) ◽  
pp. 151-155 ◽  
Author(s):  
K. Mineuchi ◽  
K. Takahashi ◽  
H. Tatsumoto
Keyword(s):  
Fluorescence Spectra ◽  
Laser Induced Fluorescence

Cervical Precancer Detection Using a Multivariate Statistical Algorithm Based on Laser-Induced Fluorescence Spectra at Multiple Excitation Wavelengths

1996 ◽  
Vol 64 (4) ◽  
pp. 720-735 ◽  
Author(s):  
Nirmala Ramanujam ◽  
Michele Follen Mitchell ◽  
Anita Mahadevan-Jansen ◽  
Sharon L. Thomson ◽  
Gregg Staerkel ◽  
...  
Keyword(s):  
Fluorescence Spectra ◽  
Laser Induced Fluorescence ◽  
Multivariate Statistical ◽  
Statistical Algorithm ◽  
Cervical Precancer

scholarly journals Absorption and Laser Induced Fluorescence Spectroscopy of Neutral Polycyclic Aromatic Hydrocarbons in Argon matrices

2015 ◽  
Vol 11 (A29A) ◽  
Author(s):  
Salma Bejaoui ◽  
Farid Salama ◽  
Ella Sciamma-O'Brien
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Fluorescence Spectra ◽  
Laser Induced Fluorescence ◽  
Broad Emission Band ◽  
Band Emission ◽  
Polycyclic Aromatic ◽  
Argon Matrices ◽  
Extended Red Emission ◽  
Solid Argon

Polycyclic aromatic hydrocarbons (PAHs) are considered as plausible carriers for the extended red emission (ERE), a photoluminescent process associated with a wide variety of interstellar environments, as well as for broad emission band features seen in cometary spectra. We report the absorption spectra of phenanthrene, anthracene, fluoranthene, pentacene, pyrene, chrysene and triphenylene isolated at 10 K in solid argon matrices together with laser induced fluorescence (LIF) spectra at 355 nm of matrix-isolated anthracene and fluoranthene. LIF spectra are compared with the UV/blue fluorescence spectra of the Red Rectangle Nebula (RR). The LIF spectra measured in solid Ar matrices have been shifted to the predicted position of the PAH band emission in the gas phase for comparison with the astronomical observations (Fig. 1).

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