Fluorescence Efficiency of Laser Dyes *
نویسنده
چکیده
The recent development of the dye laser [1] 1 has opened up an important new field of applications for organic dyes. This has led to a renewed interest in the theory of nonradiative transitions in dyes and also to the synthesis of new highly fluores cent dyes. In this article we review briefly the relations between fluor· escence and molecular structure in the most important classes of laser dyes: xanthenes , oxazines, and 7·amino· coumarins. Following this discussion specific sug· gestions for improved fluorescence standards are made. 2
منابع مشابه
Lifetime, Efficiency and Photostability Enhancement of Pyrromethene Laser Dyes by Metallic Ag Nanoparticles
Complexation of metallic silver nano particles (NPs) with Pyrromethene laser dyes (PM567, PM597) has significant effect on lifetime, photostability and the fluorescence efficiency. These enhancement of optical properties of the complex in solution due to surface Plasmon resonance (SPR) have been promised higher efficiencies in case of [40% Ag NPs: PM dye] complexes for dye laser systems. The fl...
متن کاملPlasmonic Molecular Nanohybrids—Spectral Dependence of Fluorescence Quenching
We demonstrate strong spectral dependence of the efficiency of fluorescence quenching in molecular systems composed of organic dyes and gold nanoparticles. In order to probe the coupling with metallic nanoparticles we use dyes with varied spectral overlap between the plasmon resonance and their absorption. Hybrid molecular structures were obtained via conjugation of metallic nanoparticles with ...
متن کاملPhotophysical, photochemical and laser behavior of some diolefinic laser dyes in sol–gel and methyl methacrylate/2-hydroxyethyl methacrylate copolymer matrices
The photophysical properties such as singlet absorption, molar absorptivity, fluorescence spectra, dipole moment, fluorescence quantum yields, fluorescence lifetimes and laser activity of 1,4-bis (β-Pyridyl-2Vinyl) Benzene (P2VB), 2,5-distyryl-pyrazine (DSP) and 1,4-bis(2-methylstyryl)benzene(MSB) diolefineic laser dyes have been measured in different restricted hosts. (P2VB), (DSP) and (MSB) a...
متن کاملInstantaneous temperature imaging by planar laser-induced fluorescence. Effect of high laser irradiance
The temperature dependence of the fluorescence emission of certain organic dyes is utilized for measuring the temperature in liquid flows. Measurements are generally based on the assumptions that: the fluorescence signal is proportional to the intensity of the laser excitation, and the temperature sensitivity of the dye is not affected by the laser irradiance. These assumptions allow justifying...
متن کاملDNA staining for fluorescence and laser confocal microscopy.
We examined five nucleic acid binding fluorescent dyes, propidium iodide, SYBR Green I, YO-PRO-1, TOTO-3, and TO-PRO-3, for nuclear DNA staining, visualized by fluorescence and laser confocal microscopy. The optimal concentration, co-staining of RNA, and bleaching speeds were examined. SYBR Green I and TO-PRO-3 almost preferentially stained the nuclear DNA, and the other dyes co-stained the cyt...
متن کامل