Effect of Aggregation of Rhodamine 6G on the Spectral and Luminescence Characteristics of Hybrid Mesostructured Silica Films

Leonenko, E. V.; Tel’biz, G. M.; Bogoslovskaya, A. B.; Manoryk, P. A.

doi:10.1007/s11237-015-9388-8

Cited by 8 publications

(11 citation statements)

References 16 publications

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“…These results pointed out that monomeric Rh6G was the preferential aggregate in our samples; whereas H-type dimer has a dependence of solvent content, similarly to the reported by Leonenko et al (2015) for hybrid mesostructured silica films. This suggests that besides the formation of larger pore diameters, the variables of synthesis such as evaporation rates and higher ETOH content also favored the formation of H-dimmers at certain extent.…”

Section: Aggregates Of Rh6gsupporting

confidence: 89%

“…The influence of evaporation rate of solvents is an additional key parameter that might determine the final structure (Gibaud et al, 2003). The incorporation of fluorescent dyes such as rhodamine 6G (Rh6G) to sol-gel silica materials are of great interest because of their photoluminescence applications (Leonenko et al, 2015). However, in this work we report the addition of Rh6G to promote the pore formation.…”

Section: Introductionmentioning

confidence: 93%

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Controllability of pore size on macroporous sol-gel silica films embedding rhodamine 6G

Castañeda-Contreras¹,

Guevara²,

Menéses-Nava³

et al. 2021

JART

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A facile method is reported to synthesize macroporous silica films embedding rhodamine 6G. The films were obtained by sol-gel and spin-coating processes. Results pointed out a dependence of pore formation on the addition of rhodamine 6G in the film composition. The probable formation process of the pores was attributed to the aggregation of charged species from rhodamine 6G. Although the pores were randomly distributed on the film surface, the pore size was tuned at certain extent by controlling the evaporation and condensation rates at early stages of spin coating. Results indicated that the evaporation rate determined the pore size distribution of the films.

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Section: Aggregates Of Rh6gsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 93%

Controllability of pore size on macroporous sol-gel silica films embedding rhodamine 6G

Castañeda-Contreras¹,

Guevara²,

Menéses-Nava³

et al. 2021

JART

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show abstract

“…The influence of the aggregation of Rhodamine 6G dye molecules (Rh6G) and the concentration of Pluronic 123 in the film-forming sol (SiO2 + P123 + Rh6G) on the spectral-luminescent properties of the formed silica hybrid films without magnetite NPs is studied in [17]. Fig.…”

mentioning

confidence: 99%

“…From the analysis of the absorption spectra of aqueous solutions [15] and hybrid films [17] it is known that the dye (Rh6G) in the concentration range from 1•10 -6 M to 1•10 -4 M is in monomeric form. In this case, a characteristic band of the monomeric form (λ max about 530 nm) with a vibronic arm (about 500 nm), which corresponds to a fluorescence band with λ max about 560 nm, appears in the spectrum.…”

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confidence: 99%

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THE INFLUENCE OF SUPERPARAMAGNETIC Fe3O4 NANOPARTICLES ON SPECTRAL AND LUMINESCENT PROPERTIES OF MESOSTRUCTURED SiO2/P123/Rh6G/Fe3O4 FILMS FORMED IN STATIONARY MAGNETIC FIELDS

et al. 2020

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The effect of superparamagnetic Fe3O4 nanoparticles (NPs) on the spectral luminescence properties of homogeneous optically transparent mesostructured silica films of SiO2/P123/Rh6G/Fe3O4, containing {P123 (Rh6G)} micelles consisting of Pluronic 123 with encapsulated Rh6G, and formed in stationary magnetic fields (MF) with an induction of less than 500 mT, was investigated. It was shown that, unlike SiO2/P123/Rh6G, the spectral and luminescent properties of SiO2/P123/Rh6G/Fe3O4 films depend on the MF used during their formation, and a gradual decrease in the band intensities in Rh6G spectra and quenching of luminescence with increasing of MF induction was observed. It is associated with a decrease in the monomer fraction and an increase in the fraction of non-luminescent Rh6G H-aggregates in micelles due to the interaction intensifying in the MF (formation of Fe3+ -O bonds) of superparamagnetic NPs with micelles {P123 (Rh6G)}, oriented in the MF, which leads to a gradual deformation of micelles and accumulation in them of H-aggregate. The dependences of the changes in the absorption bands intensity and fluorescence of the monomeric form of Rh6G in the spectra of the films on the changes in the magnetic induction of the MF are described by an exponential function, and the ratio of the fluorescence intensities of the SiO2/P123/Rh6G films to the fluorescence intensities of the SiO2/P123/Rh6G/Fe3O4 films linearly depends on the induction of MF, which they are able to "remember", which is manifested in the values of fluorescence intensities.

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Manipulating Laser Modes in Diffusive Disordered Systems by Precisely Designing the Boundary of the Local Pump

Shi

Song

Liang

et al. 2023

Laser & Photonics Reviews

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Manipulating laser modes in diffusive random systems is crucial to understanding the optical physics of disordered structures. However, the laser modes in diffusive random lasers are highly extended and correlated, making their manipulation difficult. Herein, this work reveals the critical role of the pump boundary on the governing mode interaction and emission characteristics of diffusive random lasers (RLs). By increasing the ratio between the square root of the pump area and the circumference of the pump region, the strongly correlated nonresonant laser mode with a continuous spectral distribution is transformed into an independent resonant laser mode with a discrete frequency distribution. A critical ratio of 5.76 is demonstrated as the transition point for pump spots with arbitrary shapes. This pump strategy provides a universal guideline for regulating laser modes in diffusive RL systems that can be applied to multifunctional lasers to clarify the behavior of light in disordered structures.

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Effect of Aggregation of Rhodamine 6G on the Spectral and Luminescence Characteristics of Hybrid Mesostructured Silica Films

Cited by 8 publications

References 16 publications

Controllability of pore size on macroporous sol-gel silica films embedding rhodamine 6G

Controllability of pore size on macroporous sol-gel silica films embedding rhodamine 6G

THE INFLUENCE OF SUPERPARAMAGNETIC Fe3O4 NANOPARTICLES ON SPECTRAL AND LUMINESCENT PROPERTIES OF MESOSTRUCTURED SiO2/P123/Rh6G/Fe3O4 FILMS FORMED IN STATIONARY MAGNETIC FIELDS

Manipulating Laser Modes in Diffusive Disordered Systems by Precisely Designing the Boundary of the Local Pump

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