Photostability of laser dyes incorporated in formamide SiO2 ORMOSILs

Valverde-Aguilar, Guadalupe

doi:10.1016/j.optmat.2005.06.020

Cited by 21 publications

(6 citation statements)

References 13 publications

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“…Here λ is the emission wavelength, n is the refractive index of the solvent, c is the velocity of light, and F(λ) is the normalized fluorescence line-shape function [54]. The normalized photostability is defined as the accumulated pump energy absorbed by the system per mole of dye molecules before the output energy falls to one half of its initial value using the following relation [55][56][57]:…”

Section: Lasing Action and Fluorescence Quenching Of Popopmentioning

confidence: 99%

Photophysical Parameters, Excitation Energy Transfer, and Photoreactivity of 1,4-Bis(5-phenyl-2-oxazolyl)benzene (POPOP) Laser Dye

El‐Daly

Elazim

El-Mekawey

et al. 2012

International Journal of Photoenergy

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The effect of solvents on the absorption and emission spectra of 1,4-bis(5-phenyl-2-oxazolyl)benzene (POPOP) laser dye has been studied in various solvents at 298 K. A bathochromic shift was observed in absorption and fluorescence spectra upon increase of solvent polarity, which indicates that this transition is π-π *. The ground and excited state dipole moments were calculated as 2.23 and 6.34 Debye, respectively. The dye solution in MeOH, n-heptane, and methyl isobutyl ketone gives laser emission in the blue region upon excitation by a 337.1 nm nitrogen pulse; the gain coefficient and emission cross section as well as normalized photostability have been determined. Excitation energy transfer from POPOP to rhodamine B and fluorescine was studied to improve the laser emission from these dyes. Such an energy transfer dye laser system (ETDL) obeys a long range columbic energy transfer mechanism with a critical transfer distance, R 0 , of 25 and 33Å and k q equal to 10.4 × 10 12 and 26.2 × 10 12 M −1 s −1 for the POPOP/RB and POPOP/fluorescine pair, respectively. The POPOP dye is highly photostable in polar protic and polar aprotic solvents, while it displays photodecomposition in chloromethane solvent via formation of a contact ion pair. The photochemical quantum yield and rate of photodecomposition depend on the electron affinity of solvent.

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Section: Lasing Action and Fluorescence Quenching Of Popopmentioning

confidence: 99%

Photophysical Parameters, Excitation Energy Transfer, and Photoreactivity of 1,4-Bis(5-phenyl-2-oxazolyl)benzene (POPOP) Laser Dye

El‐Daly

Elazim

El-Mekawey

et al. 2012

International Journal of Photoenergy

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“…Fluorescent cyanine dyes are molecules commonly used as probes or labels in different biological applications such as imaging, biomolecular labeling, and proteomics [5]. As a result of several advantages of styryl dyes as compared to classical cyanine dyes (better photostability [6], large Stokes shift, relative ease of synthesis), styrylcyanines are extensively studied as possible fluorescent probes for NA detection and visualization. Thus, styrylcyanines were shown to be low-toxic NAs-sensitive dyes, they demonstrated fluorescence intensity enhancement upon binding to NAs as well as high fluorescence quantum yield in the NAs presence [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Variation of photostability of DNA-sensitive styrylcyanine dyes caused by N-alkyl functionalization

et al. 2020

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Synthesis and characterization of benzothiazole-based styrylcyanines functionalized by different N-alkyl tail groups as potential photostable probes for nucleic acids (NA) detection. Methods. Chemical synthesis, absorption and fluorescence spectroscopy, irradiation with a visible light source, confocal microscopy. Results. Styrylcyanines are weakly fluorescent when free, but in the presence of NA they show emission intensity increase of up to 83 times; the most pronounced emission increase was observed for the dyes Sbt1 and Sbt3 bearing positively charged N-alkyl tail group. Photostability of the dyes Sbt1 and Sbt3 when non-bound to NA is low while binding to DNA results in a strong increase in their photostability. Dyes with uncharged and negatively charged N-alkyl groups are more photostable when free, and DNA slightly affects their photostability. This is also due to low binding of dyes with negatively charged tail groups to DNA. Sbt1 brightly stains cytoplasm and nuclear components (probably nucleoli) of mesenchymal stem cells; therefore this dye may be used to visualize cytoplasmic RNA and nuclear RNA clusters. Conclusions. Variation of chemical nature of N-alkyl tail group allows to design styrylcyanines of different photostability. Functionalized styrylcyanine dyes may be used for detection of nucleic acids in solution and visualization of RNA-containing components in microscopy.

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“…Therefore, the interest in dyes containing organic-inorganic hybrids has grown considerably during the last fifteen years since first reports demonstrated the possibility of applying of these materials to solid-state dye-lasers [5][6][7][8]. The potential of these materials relies on the possibility of fully exploiting the synergy between the laser action of organic dyes and the intrinsic characteristics of solgel derived hosts, namely the excellent optical quality, the low processing temperature (< 200 °C) which allows the incorporation of functional dye molecules into the hybrid matrix and the f of large amounts of emitting dyes isolated from each other and protected by the hybrid host [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Real time random laser properties of Rhodamine-doped di-ureasil hybrids

Pécoraro¹,

Garcı́a-Revilla²,

Ferreira³

et al. 2010

Opt. Express

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This investigation explores, for the first time, the random laser behavior of ground powder obtained from organic-inorganic hybrid materials based on Rhodamine 6G incorporated into a di-ureasil matrix. The experimental results, both in the spectral and temporal domains, obtained by pumping with picosecond laser pulses, show the existence of efficient random laser emission in this system. Finally, the random laser performance is compared with the one of other Rhodamine-doped solid state silica compounds.

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Photostability of laser dyes incorporated in formamide SiO2 ORMOSILs

Cited by 21 publications

References 13 publications

Photophysical Parameters, Excitation Energy Transfer, and Photoreactivity of 1,4-Bis(5-phenyl-2-oxazolyl)benzene (POPOP) Laser Dye

Photophysical Parameters, Excitation Energy Transfer, and Photoreactivity of 1,4-Bis(5-phenyl-2-oxazolyl)benzene (POPOP) Laser Dye

Variation of photostability of DNA-sensitive styrylcyanine dyes caused by N-alkyl functionalization

Real time random laser properties of Rhodamine-doped di-ureasil hybrids

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