Concentration-dependent energy transfer studies in ternary dye mixture of Stilbene-420, Coumarin-540 and Nile Blue

Sharma, Ashwani; Ahlawat, Dharamvir Singh; Mohan, Devendra; Singh, Randhir

doi:10.1016/j.saa.2007.05.067

Cited by 9 publications

(5 citation statements)

References 12 publications

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“…Such structures were produced with a laser power of 36 mW (0.15 GW/cm 2 ) and scanning speed of 20 µm/s. The fluorescence spectrum of these microstructures, displayed in Figure 7b, shows that the emission peak is located at 420 nm, which is in good agreement with the ones reported in the literature for Stilbene in several solvents 34 . Our results indicate that the fluorescent dye was not degraded during the microfabrication process, and that it is retained in the microstructures after the washing process.…”

Section: Microstructures Fabricated Using Two-photon Absorption Polymsupporting

confidence: 89%

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Femtosecond lasers for processing glassy and polymeric materials

et al. 2013

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Novel materials have been developed to meet the increasing mechanical, electrical and optical properties required for technological applications in different fields of sciences. Among the methods available for modifying and improving materials properties, femtosecond laser processing is a potential approach. Owing to its precise ablation and modification capability, femtosecond laser processing has already been employed in a broad range of materials, including glasses and polymers. When ultrashort laser pulses are focused into a transparent material, the intensity at the focus can become high enough to induce nonlinear optical processes. Here, we report on femtosecond (fs) laser microfabrication in special glasses and polymers. Initially, we describe fs-laser micromachining on the surface of copper doped borate and borosilicate glasses. Subsequently, we present results on two-photon induced polymerization to fabricate microstructures containing fluorescent dyes for manufacturing optical microcavities. Both approaches are promising for designing optical and photonics micro/nanodevices.

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Section: Microstructures Fabricated Using Two-photon Absorption Polymsupporting

confidence: 89%

“…Afterwards, the mixtures were left resting for solvent evaporation. In this work, we fabricated microstructures doped with Rhodamine B 32,33 and Stilbene 420 34 . To fabricate polymeric microstructures, a Ti: sapphire (KMLabs, 86 MHz, 780 nm, 100 fs) laser oscillator was employed.…”

Section: Femtosecond Laser Microfabrication In Polymers: Two-photon Amentioning

confidence: 99%

Femtosecond lasers for processing glassy and polymeric materials

et al. 2013

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“…2). By the addition of (TAIPDI) n , the featureless absorption band of BSSBP starts to decrease with a small shift to 346 nm, 17 while the broad and red-shifted absorption of the TAIPDI stacks appears at 507 nm, which is seen at 501 nm in the absence of BSSBP. 14,18 Isosbestic points and drastic variations in absorption characteristics indicate an electronic interaction between the components mainly through p-p interactions.…”

Section: Resultsmentioning

confidence: 99%

Tuning the photodriven electron transport within the columnar perylenediimide stacks by changing the π-extent of the electron donors

Supur

Fukuzumi

2013

Phys. Chem. Chem. Phys.

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Photodriven electron-transport properties of the self-assemblies of N,N'-di(2-(trimethylammoniumiodide)ethylene)perylenediimide stacks (TAIPDI)(n) with three electron donors, disodium 4,4'-bis(2-sulfonatostyryl)biphenyl (BSSBP, stilbene-420), sodium 9,10-dimethoxyanthracene-2-sulfonate (DANS) and disodium 6-amino-1,3-naphthalenedisulfonate (ANADS) have been studied in water. These electron donors vary in their π-extent to adjust the electronic coupling and the distance with the PDI stacks. Possessing the largest π-extent, BSSBP has strong π-π interactions as well as ionic interactions with (TAIPDI)(n). Instead of π-stacking with TAIPDI planes, DANS and ANADS, with a relatively small π-extent, are embedded in the side chains of TAIPDIs via ionic interactions, resulting in a distance increment from the aromatic TAIPDI cores. After excitation, the BSSBP-(TAIPDI)(n) system exhibits fast charge separation (0.70 ps) and relatively slow charge recombination (485 ps) due to intermolecular electron delocalization along the TAIPDI stacks. On the other hand, charge separation in DANS-(TAIPDI)(n) and ANADS-(TAIPDI)(n) occurs within 1.5 and 1.6 ns, respectively, calculated from the quenching of singlet excited states. The lifetimes of charge-separated states are determined to be 44 and 96 μs, at least 10(5) times slower than that of BSSBP-(TAIPDI)(n) due to remarkably improved electron transport throughout the (TAIPDI)(n).

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“…These limitations have precluded them from being extensively evaluated in vivo. [29][30][31][32] Another class of compounds centers on the cyclic oxobutanal ring and is referred to as squaraine or squaric acid fluorophores. 33 The extreme electrophilicity of this cyclic butane ring is susceptible to nucleophilic attack, which irreversibly diminishes the optical properties of the compound, unless the core is protected by one of several methods including rotaxane encapsulation 34 which reduces the overall applicability in small molecule bioimaging.…”

Section: Classes Of Nir Fluorophoresmentioning

confidence: 99%

NIR fluorescent small molecules for intraoperative imaging

Owens

Lee

Choi

et al. 2015

WIREs Nanomed Nanobiotechnol

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Recent advances in bioimaging and nanomedicine have permitted the exploitation of molecular optical imaging in image-guided surgery; however, the parameters mediating optimum performance of contrast agents are not yet precisely determined. To develop ideal contrast agents for image-guided surgery, we need to consider the following criteria: 1) excitation and emission wavelengths in the NIR window, 2) optimized optical characteristics for high in vivo performance, 3) overcoming or harnessing biodistribution and clearance, and 4) reducing nonspecific uptake. The design considerations should be focused on optimizing the optical and physicochemical property criteria. Biodistribution and clearance should first be considered because they mediate the fate of a contrast agent in the body such as how long after intravenous injection a contrast agent reaches the peak signal-to-background ratio (SBR) and how long the signal lasts (retention).

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Concentration-dependent energy transfer studies in ternary dye mixture of Stilbene-420, Coumarin-540 and Nile Blue

Cited by 9 publications

References 12 publications

Femtosecond lasers for processing glassy and polymeric materials

Femtosecond lasers for processing glassy and polymeric materials

Tuning the photodriven electron transport within the columnar perylenediimide stacks by changing the π-extent of the electron donors

NIR fluorescent small molecules for intraoperative imaging

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