Ultraviolet luminescence of polycyclic aromatic hydrocarbons in partially consolidated sol-gel silica glasses

Skuja, Linards; Leimane, Madara; Bite, Ivita; Millers, D.; Zolotarjovs, Aleksejs; Vitola, Virgīnija; Šmits, Krišjānis

doi:10.1016/j.jnoncrysol.2021.121325

Cited by 4 publications

(6 citation statements)

References 37 publications

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“…Therefore, we can conclude that excessive boron addition leads to a more disordered SiO 2 network. The decrease of transmittance in 1200 and 1400 nm is attributed to vibrational overtones of C–H bonds by Pogareva et al [ 48 ], and it is possible that some organic material is still present in the samples from the synthesis, as described in [ 22 ].…”

Section: Resultsmentioning

confidence: 99%

“…In this study, Sr 0.97 Eu 0.01 Dy 0.02 Al 2-x B x O 4 /SiO 2 composite materials samples were synthesized by using the sol–gel method following the procedure described by Skuja et al [ 22 ]. Additional steps were added to this synthesis process to obtain 2 wt% SrAl 2 O 4 :Eu, Dy, and B in SiO 2 glass.…”

Section: Methodsmentioning

confidence: 99%

“…All the chemicals used in this work are reagent and analytical grade and were used without further purification. composite materials samples were synthesized by using the sol-gel method following the procedure described by Skuja et al [22]. Additional steps were added to this synthesis process to obtain 2 wt% SrAl 2 O 4 :Eu, Dy, and B in SiO 2 glass.…”

Section: Methodsmentioning

confidence: 99%

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Sol–Gel Synthesis of Translucent and Persistent Luminescent SiO2@ SrAl2O4 Eu, Dy, B Materials

Leimane,

Krizmane,

Bite

et al. 2023

Materials

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This publication offers an economically promising method of persistent luminescent silicate glass synthesis that does not involve high temperatures or ready-made (separately synthesized) PeL particles. In this study, we demonstrate the formation of SrAl2O4 doped with Eu, Dy, and B in a SiO2 glass structure using the one-pot low-temperature sol–gel synthesis method. By varying the synthesis conditions, we can use water-soluble precursors (e.g., nitrates) and a dilute aqueous solution of rare-earth (RE) nitrates as starting materials for SrAl2O4 synthesis, which can be formed during the sol–gel process at relatively low sintering temperatures (600 °C). As a result, translucent, persistently luminescent glass is obtained. The glass shows the typical Eu2+ luminescence and the characteristic afterglow. The afterglow duration is about 20 s. It is concluded that the slow drying procedure (2 weeks) is optimal for these samples to sufficiently get rid of the excess water (mainlyOH groups) and solvent molecules that can influence the strontium aluminate luminescence properties and have a pernicious effect on the afterglow. It can also be concluded that boron is playing a crucial role in the formation of trapping centers needed for PeL processes in the PeL silicate glass.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Sol–Gel Synthesis of Translucent and Persistent Luminescent SiO2@ SrAl2O4 Eu, Dy, B Materials

Leimane,

Krizmane,

Bite

et al. 2023

Materials

Self Cite

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“…In addition, by analyzing samples with different pore sizes we rationalized that the emitting centers can be stabilized in slightly different geometries with different optical properties, since the increase of the Si-Si distance in larger pore diameter samples produces a slight blue shift of the emissions. However, the assignment was recently questioned [51], reporting some spectra with vibrational features upon the emission whose contribution was increased by annealing in O 2 or H 2 at quite high temperatures. Since MS can contain residual carbon species due to the surfactant exploited during the synthesis or even due to the adsorption of CO 2 from the atmosphere, the formation of some PAHs was considered by the authors.…”

Section: Exploiting Optical Properties Of Void Msmentioning

confidence: 99%

The void side of silica: surveying optical properties and applications of mesoporous silica

Olla,

Carbonaro

2024

J. Phys.: Condens. Matter

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Mesoporous silica stands out as a remarkable, low-density transparent material characterized by well-defined nanometric pore sizes. It is available in various morphologies, including monoliths, nanoparticles, and films. This material plays a pivotal role in numerous technological applications, both independently and as a component in hybrid composites, acting as a host for a diverse range of inorganic and organic materials. Among the synthetic routes, we accounted for the sol-gel method because of its large success in producing both nanoparticles and bulk mesoporous silica. This review focuses on exploring the optical properties of mesoporous silica and mesoporous silica-based composites, delving into how the huge void space within mesoporous silica can be harnessed across various fields: thermal and electrical insulations, photonics, environmental devices, or nanocargos for drugs and bioimaging. This comprehensive examination underscores the multifaceted potential of mesoporous silica, positioning it as a key player in the development of innovative solutions across various scientific domains.

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“…This shift is too significant to be assigned to only ODC(I). The shift of the 4.3 eV peak in principle can be interpreted as the result of the formation of additional peaks at E < 4 eV, which can be assigned to specific carbon containing residues [59][60][61][62][63]. In the general case, the formation of (≡Si-Si≡) type defects should occur due to the destruction of certain bonds of Si atoms.…”

Section: Ethylene Bridged Pmomentioning

confidence: 99%

Understanding the Origin of Luminescence in Porous Organosilica Films with Various Organic Components

Rasadujjaman¹,

Zhang²,

Spassky³

et al. 2023

Preprint

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UV induced photoluminescence of organosilica films with ethylene and benzene bridging groups in their matrix and terminal methyl groups on the pore wall surface is studied to reveal optically active defects and understand their origin and nature. Careful selection of the film’s precursors and conditions of deposition and curing, analysis of chemical and structural properties led to the conclusion that luminescence sources are not associated with the presence of oxygen-deficient centers, as in the case in pure SiO2. It is shown that the sources of luminescence are the carbon-containing components that are part of the low-k-matrix, as well as the carbon residues formed upon removal of the template and UV induced destruction of organosilica samples. A good correlation between the energy of the photoluminescence peaks and the chemical composition is observed. This correlation is confirmed by the results obtained by the Density Functional theory. The photoluminescence intensity increases with porosity and internal surface area. The spectra become more complicated after annealing at 400 °C, although Fourier transform infrared spectroscopy does not show these changes. The appearance of additional bands is associated with compaction of low-k matrix and segregation of template residues on the surface of the pore wall.

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Ultraviolet luminescence of polycyclic aromatic hydrocarbons in partially consolidated sol-gel silica glasses

Cited by 4 publications

References 37 publications

Sol–Gel Synthesis of Translucent and Persistent Luminescent SiO2@ SrAl2O4 Eu, Dy, B Materials

Sol–Gel Synthesis of Translucent and Persistent Luminescent SiO2@ SrAl2O4 Eu, Dy, B Materials

The void side of silica: surveying optical properties and applications of mesoporous silica

Understanding the Origin of Luminescence in Porous Organosilica Films with Various Organic Components

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