Effect of temperature on the fluorescence emission of 2H-chromen-2-one derivative in non-polar and polar solvents

Evale, Basavaraj G.; Hanagodimath, S.M.; Kulkarni, Manohar V.

doi:10.1016/j.jlumin.2010.03.004

Cited by 8 publications

(3 citation statements)

References 20 publications

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“…Mishra et al reported eosin phosphorescence spectrum in glycerol with a maximum at 690 nm, and the fluorescence maximum was observed at 550 nm. The eosin fluorophore has a relatively high quantum efficiency(ϕ); ϕ = 0.2 in water and ϕ = 0.69 in ethanol . Spreading large Au-SHINs onto the EOSDEC LB monolayer produces a random distribution of SHINs on the LB surface, and, correspondingly, various enhancement factors are estimated, as can be seen in Figure .…”

Section: Results and Discussionmentioning

confidence: 99%

“…The eosin fluorophore has a relatively high quantum efficiency-(ϕ); ϕ = 0.2 in water and ϕ = 0.69 in ethanol. 24 Spreading large Au-SHINs onto the EOSDEC LB monolayer produces a random distribution of SHINs on the LB surface, and, correspondingly, various enhancement factors are estimated, as can be seen in Figure 7. A maximum EF of 110-fold was detected for the monomer fluorescence.…”

Section: ■ Introductionmentioning

confidence: 99%

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Increasing the Enhancement Factor in Plasmon-Enhanced Fluorescence with Shell-Isolated Nanoparticles

Camacho

Aoki²,

Albella

et al. 2015

J. Phys. Chem. C

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Three central experimental variables are looked at to increase the observed enhancement factor in plasmonenhanced fluorescence: nanoparticle size, nanoparticle aggregation, and the sample temperature. The rise in emission intensity is demonstrated here in carefully chosen experimental conditions. First, it is shown that shell-isolated nanoparticles of gold (Au-SHINs) with a core of 100 nm produce a higher enhancement factor than smaller Au-SHINs (with a core of 40 nm) in solution and on Langmuir−Blodgett (LB) films. The enhancement factor is further increased by aggregation of the Au-SHINs in solution, and the findings are supported by finitedifference time-domain (FDTD) computations. Second, the enhancement factor (110-fold) of plasmon-enhanced fluorescence achieved with large Au-SHINs on an LB film of eosin decyl ester (EOSDEC) increases dramatically at low temperatures (170 fold). High enhancement factors are underpinned by a close matching of the plasmon extinction and fluorescence emission.

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Section: Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Increasing the Enhancement Factor in Plasmon-Enhanced Fluorescence with Shell-Isolated Nanoparticles

Camacho

Aoki²,

Albella

et al. 2015

J. Phys. Chem. C

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“…At lower temperatures, these free energy carriers undergo radiative decay because the quantity of the photon traps and structural defects are decreased due to lower molecular motion within the extended structure of the PEPy‐COF. [ 61–68 ] After 370 K, no noticeable changes in the fluorescence intensity were observed. Generally, the fluorescence intensity depends on different processes, but the inherent fluorescence of a fluorophore should be independent of temperature.…”

Section: Resultsmentioning

confidence: 99%

Pyrene‐Based Polyimide Covalent Organic Framework with Temperature‐Dependent Fluorescence

Zadehnazari

Khosropour

Altaf

et al. 2023

Advanced Optical Materials

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The synthesis of a fluorescent covalent organic framework (COF) using perylene and pyrene building blocks (PEPy-COF), via a one-pot condensation reaction is reported. PEPy-COF is crystallized into 2D nanosheets with a cubic and prismatic crystalline morphology and demonstrates structural stability at temperatures up to 500 °C. The structural morphology is confirmed using X-ray diffraction and atomic-level simulations. These 2D porous polymer sheets form a tetragonal framework that is found to have a high specific surface area of 772 m 2 g −1 . Based on the definition of porous materials, the network is mesoporous with an observed pore size of 3.03 nm, which is in good agreement with the material's calculated pore size. The experimentally obtained HOMO-LUMO band gap is 2.62 eV, confirming the semiconducting nature of PEPy-COF. PEPy-COF emits a shiny blue luminescence under UV and visible light. This luminescence intensity is temperature-dependent in solvents with different polarities and dielectric constants demonstrating that the PEPy-COF has potential use in a wide range of temperature-sensing devices. The fluorescence intensity ratio is similar for different temperatures under ultra-sound conditions and varying solvents.

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Bimolecular fluorescence quenching reactions of the biologically active coumarin composite 2‐acetyl‐3H‐benzo[f]chromen‐3‐one in different solvents

Koppal

Melavanki

Kusanur³

et al. 2018

Luminescence

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A study on fluorescence quenching was carried out for the coumarin derivative 2-acetyl-3H-benzo[f]chromen-3-one (2AHBC) with aniline at room temperature. Efficient fluorescence quenching was observed and Stern-Volmer (S-V) plots showed upward curves from linearity in all solvents of different polarities. For the solute 2AHBC, ground state complex formation does not hold in our study. The kinetic distance (r) value was found to be greater than the encounter distance (R) and indicated that the quenching reaction was held within the sphere of action. Diffusion-limited reactions were found to be more prominent in high polarity solvents, namely dimethyl sulfoxide (DMSO), DMF, ACN, methanol, ethanol, propanol and DCM. The relationships between quenching constant (K ) and dielectric constants (ε) of the different solvents were studied.

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Effect of temperature on the fluorescence emission of 2H-chromen-2-one derivative in non-polar and polar solvents

Cited by 8 publications

References 20 publications

Increasing the Enhancement Factor in Plasmon-Enhanced Fluorescence with Shell-Isolated Nanoparticles

Increasing the Enhancement Factor in Plasmon-Enhanced Fluorescence with Shell-Isolated Nanoparticles

Pyrene‐Based Polyimide Covalent Organic Framework with Temperature‐Dependent Fluorescence

Bimolecular fluorescence quenching reactions of the biologically active coumarin composite 2‐acetyl‐3H‐benzo[f]chromen‐3‐one in different solvents

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