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Structural and Luminescence Properties of Glass
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Structural and Luminescence Properties of Glass

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced and Functional Ceramics and Glasses".

Deadline for manuscript submissions: closed (20 March 2024) | Viewed by 1761

Special Issue Editor

Dr. Bogdan A. Sava

E-Mail Website
Guest Editor
National Institute for Laser, Plasma and Radiation Physics, Bucharest, Romania
Interests: phosphate glass; borate glass; tellurite glass; rare-earth ions; photoluminescence; transition levels; fluorescent lifetime; FTIR-Raman spectroscopy; MAS-NMR; EXAFS-XANES
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Comparatively to silicate glasses, the phosphate glasses network can include luminescent (rare-earth, transition) ions in higher concentrations, with increased energy of emitted radiation. Boron oxide-based glasses exhibit a large glass formation range and high properties like enhanced transparency, together with thermal, chemical, and radiation stability. Zinc-tellurite glass has received widespread attention lately due to its promising potential as a rare-earth elements host for lasers or optical fibers. New interesting vitreous systems for luminescence purposes such as bismuthate and germanate systems are being studied nowadays. The structural characterization of such glasses includes short-range investigations, using Magic-Angle Spinning Nuclear Magnetic Resonance (MAS-NMR), Fourier Transform Infrared (FTIR), Raman spectroscopy and Extended X-Ray Absorption Fine Structure (EXAFS), and X-ray Absorption Near Edge Structure (XANES). Between the recent glass structure models, the molecular dynamic simulation seems the most appropriate. Luminescence studies include absorption and emission spectra; photoluminescence excitation; temperature-dependent and time-dependent photoluminescence; luminescence decay spectra; and, if more than one luminescent ion is involved, the energy transfer process. These processes can be modelled, for example, by stretched exponential Kohlraush/Williams/Watts (KWW) functions or by multiple exponential models implying several discrete lifetimes for different depopulation routes. The main applications of luminescent glasses are energy harvesting, lasers, and optoelectronics.

Dr. Bogdan A. Sava
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • phosphate glass
  • borate glass
  • tellurite glass
  • rare-earth ions
  • photoluminescence
  • transition levels
  • fluorescent lifetime
  • FTIR-Raman spectroscopy
  • MAS-NMR
  • EXAFS-XANES

Published Papers (2 papers)

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Research

16 pages, 9832 KiB  
Article
Effect of ZnO on Luminescence Performance of Terbium-Activated Zinc Borosilicate Glasses
by Sena Dayioglugil and Nuri Solak
Materials 2024, 17(9), 2154; https://doi.org/10.3390/ma17092154 - 4 May 2024
Viewed by 507
Abstract
In this study, terbium-doped ZnO-SiO2-B2O3-Na2O glasses were fabricated with the conventional melt-quenching method. The effect of altering the concentration of the host matrix on luminescence performance was investigated in terms of different ZnO/B2O [...] Read more.
In this study, terbium-doped ZnO-SiO2-B2O3-Na2O glasses were fabricated with the conventional melt-quenching method. The effect of altering the concentration of the host matrix on luminescence performance was investigated in terms of different ZnO/B2O3 and ZnO/SiO2 ratios. FT-IR results indicate that bridging oxygens (Bos) were converted to non-bridging oxygens (NBOs) with increments of ZnO. Furthermore, the emission intensity and luminescence lifetime of samples were influenced by the amount of ZnO; this was proven with photoluminescence spectra results. The maximum emission intensity was observed at a 1.1 ZnO/B2O3 ratio and a 0.8 ZnO/SiO2 ratio; however, the highest luminescence lifetime was observed at a 1.1 ZnO/SiO2 ratio. The emission intensity and luminescence lifetime of glass samples were improved by heat treatment as a result of the formation of willemite and zinc oxide phases. An increase in the ZnO/SiO2 ratio facilitated the formation of willemite and zinc oxide phases; therefore, crystallinity was directly related to the luminescence behavior of glass samples. Full article
(This article belongs to the Special Issue Structural and Luminescence Properties of Glass)
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14 pages, 3599 KiB  
Article
A Nanocomposite Sol-Gel Film Based on PbS Quantum Dots Embedded into an Amorphous Host Inorganic Matrix
by Mihail Elisa, Bogdan Alexandru Sava, Mihai Eftimie, Adrian Ionut Nicoara, Ileana Cristina Vasiliu, Madalin Ion Rusu, Cristina Bartha, Monica Enculescu, Andrei Cristian Kuncser, Mihai Oane, César Elosúa Aguado and Diego López-Torres
Materials 2023, 16(22), 7105; https://doi.org/10.3390/ma16227105 - 9 Nov 2023
Viewed by 857
Abstract
In this study, a sol-gel film based on lead sulfide (PbS) quantum dots incorporated into a host network was synthesized as a special nanostructured composite material with potential applications in temperature sensor systems. This work dealt with the optical, structural, and morphological properties [...] Read more.
In this study, a sol-gel film based on lead sulfide (PbS) quantum dots incorporated into a host network was synthesized as a special nanostructured composite material with potential applications in temperature sensor systems. This work dealt with the optical, structural, and morphological properties of a representative PbS quantum dot (QD)-containing thin film belonging to the Al2O3–SiO2–P2O5 system. The film was prepared using the sol-gel method combined with the spin coating technique, starting from a precursor solution containing a suspension of PbS QDs in toluene with a narrow size distribution and coated on a glass substrate in a multilayer process, followed by annealing of each deposited layer. The size (approximately 10 nm) of the lead sulfide nanocrystallites was validated by XRD and by the quantum confinement effect based on the band gap value and by TEM results. The photoluminescence peak of 1505 nm was very close to that of the precursor PbS QD solution, which demonstrated that the synthesis route of the film preserved the optical emission characteristic of the PbS QDs. The photoluminescence of the lead sulfide QD-containing film in the near infrared domain demonstrates that this material is a promising candidate for future sensing applications in temperature monitoring. Full article
(This article belongs to the Special Issue Structural and Luminescence Properties of Glass)
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