Dual fluorescence and laser emissions from fluorescein-Na and eosin-B

Math, N N; Naik, L. R.; Suresh, H.M.; Inamdar, Sanjeev R.

doi:10.1016/j.jlumin.2005.11.013

Cited by 26 publications

(14 citation statements)

References 33 publications

(37 reference statements)

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“…In the DSSCs application, it is much of interests to concentrate in the visible solar spectrum. In addition, to that the molar extinction coefficient of EY equals 112,000 (cmM) -1 [39] which is greater than that of RB (106,000 (cmM) -1 ) [40] and much higher than that of EB (50620 (cmM) -1 ) [41], corresponding to π →π* transitions of conjugated molecules. This may explain the higher performance of DSSCs using EY above that using of other dyes.…”

Section: Photovoltaic Parametersmentioning

confidence: 99%

Synthesis and Characterization of Zno Nanoparticles Using Hydrothermal and Sol-Gel Techniques for Dye-Sensitized Solar Cells

Musleh

Al-Dahoudi

Zayed

et al. 2018

JUBES

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ZnO nanoparticles (ZnO NPs) were synthesized using hydrothermal and sol-gel techniques using zinc acetate dihydrate (Zn (CH3COO)2.2H2O) as a row material and methanol as a solvent. The structural properties of ZnO NPs were studied using EDX, XRD, TEM, and the optical properties were characterized using UV-VIS and PL spectroscopies. The synthesized ZnO NPs showed high purity and revealed a wurtzite (hexagonal) crystal structure with particle size (D) ranged from 25 nm to 28 nm. The UV-VIS absorption spectra of ZnO NPs samples and sensitizing dyes were performed. The obtained ZnO NPs exhibited the direct optical bandgap 3.15 eV. Dye-sensitized solar cells (DSSCs) were fabricated using synthesized ZnO NPs as a semiconducting layer, which was dyed with different low cost dyes such as Eosin B (EB), Eosin Y (EY) and Rhodamine B (RB) that was used to sensitize the photoanode (ZnO NPs). The experimental results showed a significant efficiency for the fabricated DSSCs of synthesized ZnO NPs via sol gel technique comparing to hydrothermal technique. The EY dye exhibited the best performance among others, where a conversion efficiency showed a noteworthy improvement from 0.12 to 1.08 %.

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Section: Photovoltaic Parametersmentioning

confidence: 99%

Synthesis and Characterization of Zno Nanoparticles Using Hydrothermal and Sol-Gel Techniques for Dye-Sensitized Solar Cells

Musleh

Al-Dahoudi

Zayed

et al. 2018

JUBES

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“…Fluorescein powder does not exhibit luminescence properties; while in aqueous media the fluorescein dye is characterized by a bright yellow-green emission under blue excitation (fig. 3a) [5,26,27]. As shown in Fig 3b and c, a yellow green emission is recorded for HDL/fluorescein powder upon excitation at 450 nm, which is the wavelength corresponding to the emission of a commercial blue LED for a potential further association.…”

Section: Emission Spectra Interpretationmentioning

confidence: 91%

Revisiting fluorescein and layered double hydroxide using a synergistic approach: A complete optical study

Legentil

Leroux

Thérias

et al. 2019

Journal of Luminescence

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The luminescence of Fluorescein, an inexpensive dye, ought to be interesting for lighting application devices such as commercial LEDs. However, the molecule suffers from severe instability, making it inappropriate for such applications. As previously studied, fluorescein molecules may be hosted in a layered double hydroxide (LDH), and the role of such an inorganic material in stabilizing the dye has been underlined. However, a deep understanding of the resulting optical properties is still required. Using extremely small amounts of fluorescein, it is demonstrated here that Zn 2 Al cation-based LDH tethering acts as a «solid solvent» for the dye, enabling its luminescence even in powder form, whereas fluorescein molecules on their own emit no luminescence at all in the solid state. However, aggregations of the dye occur in the interlamellar space, leading to non-radiative emission. Emission and excitation spectra, as well as fluorescence decays, are studied to explain the difference between the hybrid LDH-Fluorescein material and an aqueous solution of fluorescein. Additionally, LDH platelets are found to help the dispersion of the intercalated fluorescein in silicone to obtain a homogeneous composite film, which exhibits luminescent properties. Finally, an accelerated photoaging study demonstrates that the LDH-fluorescein filler has a pro-degradant effect on polymer aging under UV radiation.

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“…Despite the advance in the formulation of the ICT models, they have resulted to be insufficient for interpreting the dual emission of a large variety of fused-heterocyclic dyes and the generation of the CT state would seem to be associated with an ICT within the fused-heterocyclic ring, which is independent of the nature of exocyclic (D)- or (A)-groups. For example, mechanisms like TICT or PICT have been discarded for coumarins and quinolin-4(1 H )-one dyes because its dual emission has not shown correlation with the restricted or free-motion nature of the exo-EDG at the benzo core. − As a consequence, other non-ICT mechanisms like photo-induced electron transfer (PET) or formation of oligomers have been proposed for interpreting the dual emission of some fused heterocycles such as coumarins and rhodamines, respectively, , although these mechanisms seem to be restricted to interpret the dual emission of these mentioned molecular systems. However, it is interesting to highlight that most of these dual-emissive dyes are incompatible with the ICT models bearing a pseudo-aromatic ring in a rigid structure (Chart c), − which opens the door to the occurrence of an ICT process dependent on the aromatization or partial aromatization of the pseudo-aromatic ring as an (A) moiety, which is a suitable process to stabilize the electronic distribution of the excited state and generate a stable charged state (CT).…”

Section: Introductionmentioning

confidence: 99%

Photo-Induced Partially Aromatized Intramolecular Charge Transfer

Romero

Piro

et al. 2021

J. Phys. Chem. B

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Diverse models of intramolecular charge transfer (ICT) have been proposed for interpreting the origin of the charge-transfer (CT) state in donor–acceptor (D–A) dyes. However, a large variety of fused-heterocyclic dyes containing a pseudo-aromatic ring in the rigid structure have shown to be incompatible with them. To approximate a solution within the ICT concept, we reported a novel ICT model called partially aromatized intramolecular charge transfer (PAICT). PAICT involves the generation of a CT state from an ICT that occurred within a pre-excited D–A fused-heterocyclic structure possessing a pseudo-aromatic or unstable aromatic ring as the acceptor moiety. The model was proposed from the multiple-emissive mesomeric D–A N 1 -aryl-2-(trifluoromethyl)benzo[b][1,8]naphthyridin-4(1H)-one, whose excited mesomeric states, which are defined by the aromatic and pseudo-aromatic forms of the pyrindin-4(1H)-one ring, led to a common partial aromatized CT state upon excitation via PAICT. The latter was supported through theoretical calculations on the excited mesomeric states, one-dimensional (1D) and two-dimensional (2D) excitation–emission measurements in different solvents, and the detection of three excited states by lifetime measurements upon 370 nm excitation. The existence of mesomerism was supposed from: (i) two overlapping bands at 370–390 (or 400–420 nm) in UV–vis spectra, (ii) the direct interaction between the pyridinic nitrogen of one molecule and the carbonylic oxygen of the other found in the solid state and, (iii) the detection of three excited states by lifetime measurements. The PAICT opens new perspectives for interpreting the charge-transfer phenomenon in fused-heterocyclic dyes, in particular, those containing a pseudo-aromatic or unstable aromatic ring as an acceptor moiety.

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Dual fluorescence and laser emissions from fluorescein-Na and eosin-B

Cited by 26 publications

References 33 publications

Synthesis and Characterization of Zno Nanoparticles Using Hydrothermal and Sol-Gel Techniques for Dye-Sensitized Solar Cells

Synthesis and Characterization of Zno Nanoparticles Using Hydrothermal and Sol-Gel Techniques for Dye-Sensitized Solar Cells

Revisiting fluorescein and layered double hydroxide using a synergistic approach: A complete optical study

Photo-Induced Partially Aromatized Intramolecular Charge Transfer

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