Solvent-induced Stokes’ shift in DCJTB: Experimental and theoretical results

Sousa, Iran da Luz; Ximenes, Valdecir Farias; Souza, Aguinaldo Robinson de; Morgon, Nelson H.

doi:10.1016/j.molstruc.2019.04.117

Cited by 14 publications

(4 citation statements)

References 17 publications

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“…Figure 5 a shows the absorption spectra of the red fluorescent film. The maximum absorption peak was found to be at 518 nm for the film [ 42 , 43 , 44 ]. On the other hand, the absorption spectra of the green fluorescent films are shown in Figure 5 b, which exhibited a maximum absorption at 456 nm.…”

Section: Resultsmentioning

confidence: 99%

Polyvinyl Butyral Polymeric Host Material-Based Fluorescent Thin Films to Achieve Highly Efficient Red and Green Colour Conversion for Advanced Next-Generation Displays

et al. 2023

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Rare-earth element-free fluorescent materials are eco-friendlier than other traditional fluorescent precursors, such as quantum dots and phosphors. In this study, we explore a simple and facile solution-based technique to prepare fluorescent films, which are highly stable under ordinary room conditions and show hydrophobic behaviour. The proposed hybrid material was designed with hybrid composites that use polyvinyl butyral (PVB) as a host doped with organic dyes. The red and green fluorescent films exhibited quantum yields of 89% and 80%, respectively, and both are very uniform in thickness and water resistant. Additionally, PVB was further compared with another polymeric host, such as polyvinylpyrrolidone (PVP), to evaluate their binding ability and encapsulation behaviour. Next, the effect of PVB on the optical and chemical properties of the fluorescent materials was studied using UV spectroscopy and Fourier transform infrared spectroscopy. The analysis revealed that no new bond was formed between the host material and fluorescent precursor during the process, with intermolecular forces being present between different molecules. Moreover, the thickness of the fluorescent film and quantum yield relation were evaluated. Finally, the hydrophobic nature, strong binding ability, and optical enhancement by PVB provide a powerful tool for fabricating a highly efficient fluorescent film with enhanced stability in an external environment based on its promising encapsulation properties. These efficient fluorescent films have a bright potential in colour conversion for next-generation display applications.

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Section: Resultsmentioning

confidence: 99%

Polyvinyl Butyral Polymeric Host Material-Based Fluorescent Thin Films to Achieve Highly Efficient Red and Green Colour Conversion for Advanced Next-Generation Displays

et al. 2023

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“…The unfitted absorption and fluorescence spectra of Q1 are shown in Fig. 8 , additional data for anisole can be found in [8 , 9] . It is necessary to apply a good fit to the measured data, to avoid measurement artifacts or noise that could lead to an artificially shifted band.…”

Section: Determination Of the Ground State Dipole Moment From Permittmentioning

confidence: 94%

“…Although the determination of excited state dipole moments using solvatochromic shifts of absorption/emission spectra in different solvents has many shortcomings, that are well-documented [1] , [2] , [3] , [4] – 5] , it is still widely applied experimentally [6] , [7] , [8] – 9] and investigated theoretically [10] , due to its conceptual and experimental simplicity. Recently, dipole moment changes upon electronic excitation, even of different conformers, could be resolved in solution by a combination of stationary and time-resolved fluorescence measurements and ultraviolet−visible transient absorption spectroscopy [11] .…”

Section: Introductionmentioning

confidence: 99%

Determination of excited state dipole moments in solution via thermochromic methods

et al. 2020

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The method basically combines the existing ideas of excited state dipole moment determination via thermochromic fluorescence spectroscopy with the determination of the solvent cavity volume via concentration dependent density measurements of the solution densities at different weight fractions. Additionally, the determination of the cavity volume in dependence of the solvent temperature is included here, which provides a better accuracy of the excited state dipole moment determination. With this step two major sources of errors are eliminated: the use of the very imprecise Onsager radius and the assumption, that the cavity size is temperature independent. Thermochromic absorption and fluorescence spectroscopy. Cavity volume determination by density measurements. Temperature dependent cavity volume determination.

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“…The Lippert-Mataga equation allows for the calculation of the change in dipole moment by considering the shift in absorption and fluorescence maxima in different solvents, providing insights into the polarity of the molecules and their interactions with the surrounding environment. The equation forms a fundamental basis for studying the influence of solvents on the electronic structure and behavior of molecules [52,53]:…”

Section: Lippert -Matage Methodsmentioning

confidence: 99%

Photo-Physical Characteristics of Janus Green B in Different Solvents and its Interaction Mechanism with Silver Nanoparticles

Gawad,

Ghazy,

Mansour

et al. 2024

J Fluoresc

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This work explores the effects of solvent polarity on Janus Green B (JGB) photophysical properties. The Lippert-Mataga, Billot, and Ravi equations were utilized to calculate the singlet-state excited dipole moments (µe) and ground state dipole moments (µg) using absorption and fluorescence spectra analyses. The results showed an increase in the former, which is suggestive of electronic structural alterations upon excitation. Analysis of fluorescence quantum yield values revealed that JGB’s environment had an impact on its emission characteristics; it was particularly sensitive to silver nanoparticles, suggesting possible interactions. While simulations of electron density, electrostatic potential, and energy gap (Eg) helped to understand the electronic structure of JGB, theoretical absorption spectra produced by Time Dependent Density Function Theory (TD-DFT) calculations offered insights into electronic transitions during absorption. To sum up, the present study contributes to our comprehension of the molecular behavior of JGB in various solvents by elucidating the intricate relationship among solvent polarity, molecular environment, and interactions with silver nanoparticles. Additionally, theoretical computations support the interpretation of experimental results.

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Solvent-induced Stokes’ shift in DCJTB: Experimental and theoretical results

Cited by 14 publications

References 17 publications

Polyvinyl Butyral Polymeric Host Material-Based Fluorescent Thin Films to Achieve Highly Efficient Red and Green Colour Conversion for Advanced Next-Generation Displays

Polyvinyl Butyral Polymeric Host Material-Based Fluorescent Thin Films to Achieve Highly Efficient Red and Green Colour Conversion for Advanced Next-Generation Displays

Determination of excited state dipole moments in solution via thermochromic methods

Photo-Physical Characteristics of Janus Green B in Different Solvents and its Interaction Mechanism with Silver Nanoparticles

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