Special Issue "Recent Advances on Optical, Structural and Luminescence Properties of Glass and Glass-Ceramics"

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: 31 August 2020.

Special Issue Editors

Prof. Laeticia Petit
E-Mail Website
Guest Editor
Photonics Laboratory, Tampere University, Tampere FI-33101, Finland
Interests: glass; glass–ceramic; structure; nanocrystal; optical fiber; thin film; photonics
Special Issues and Collections in MDPI journals
Dr. Alexander Veber
E-Mail Website
Guest Editor
Photonics Laboratory, Tampere University, Tampere FI-33101, Finland
Interests: novel optical materials; glass; glass–ceramic; laser physics; optical characterization of materials

Special Issue Information

Dear Colleagues,

The addition of rare-earth (RE) ions into glasses has become of great interest for a wide range of applications related to telecommunications, light detection and ranging (LIDAR), solar panels, and spectroscopy, just to cite a few. As the optical (including luminescence) properties are mainly determined by the local environment around the RE ions, effort has been focused worldwide on the development of new glasses with exotic compositions. Since their discovery in 1953, glass–ceramics have also become of particular focus. These materials are produced by controlled crystallization of glasses and therefore contain one or more crystalline phases evenly distributed within the glass phase. Controlled ceramization yields an array of materials with interesting combinations of properties, especially with enhanced optical properties (such as absorption and emission cross-sections and energy transfer rates) compared to their glassy counterparts, if the crystalline phase of the desired nature and structure precipitates around the rare-earth ions.

The aim of this Special Issue is to highlight the latest developments in glasses and glass–ceramics, and especially to advance the fundamental understanding of the relationship between material chemistry (both composition and structure) and optical, in particular luminescence properties. Topics of interest also include the latest research on advanced characterization of material properties and new processing methods for the fabrication of glasses and glass–ceramics.

We do believe this collection will stimulate and circulate new ideas on the topic and will contribute to the dissemination of expertise for young investigators, as well as leading experts in the field.

Prof. Laeticia Petit
Dr. Alexander Veber
Guest Editors

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 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

  • glasses
  • glass–ceramics
  • processing methods
  • property characterization
  • optical
  • structure
  • luminescence

Published Papers (6 papers)

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Research

Open AccessArticle
Impact of ZnO Addition on Er3+ Near-Infrared Emission, the Formation of Ag Nanoparticles, and the Crystallization of Sodium Fluorophosphate Glass
Materials 2020, 13(3), 527; https://doi.org/10.3390/ma13030527 - 22 Jan 2020
Abstract
The impact of the progressive addition of ZnO up to 5 mol% on the thermal, structural, and optical properties of Er3+-doped phosphate glasses within the system NaPO3-NaF-ZnO-Ag2O is discussed. The glass network was found to depolymerize upon [...] Read more.
The impact of the progressive addition of ZnO up to 5 mol% on the thermal, structural, and optical properties of Er3+-doped phosphate glasses within the system NaPO3-NaF-ZnO-Ag2O is discussed. The glass network was found to depolymerize upon the addition of ZnO. This promotes a slight increase in the intensity of the emission at 1.5 µm as well as enhances the silver ions clustering ability under the heat treating. The Ag-nanoparticles formed after moderate heat-treatment can further enhance the emission at 1.5 µm, whereas an excessive amount of the clusters leads to the opposite effect. The addition of ZnO helps to slightly increase the glass ability of the system. The crystallization behavior study revealed that surface crystallization is observed for all the glasses. It is found that even a small ZnO addition changes the crystalline phases formed after devitrification. Moreover, the addition of ZnO decreases the crystallization tendency of the glass. Full article
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Open AccessArticle
Powder-in-Tube Reactive Molten-Core Fabrication of Glass-Clad BaO-TiO2-SiO2 Glass–Ceramic Fibers
Materials 2020, 13(2), 395; https://doi.org/10.3390/ma13020395 - 15 Jan 2020
Abstract
In this paper we report the fabrication of glass-clad BaO-TiO2-SiO2 (BTS) glass–ceramic fibers by powder-in-tube reactive molten-core drawing and successive isothermal heat treatment. Upon drawing, the inserted raw powder materials in the fused silica tubing melt and react with the [...] Read more.
In this paper we report the fabrication of glass-clad BaO-TiO2-SiO2 (BTS) glass–ceramic fibers by powder-in-tube reactive molten-core drawing and successive isothermal heat treatment. Upon drawing, the inserted raw powder materials in the fused silica tubing melt and react with the fused silica tubing (housing tubing) via dissolution and diffusion interactions. During the drawing process, the fused silica tubing not only serves as a reactive crucible, but also as a fiber cladding layer. The formation of the BTS glass–ceramic structure in the core was verified by micro-Raman spectroscopy after the successive isothermal heat treatment. Second-harmonic generation and blue-white photoluminescence were observed in the fiber using 1064 nm and 266 nm picosecond laser irradiation, respectively. Therefore, the BTS glass–ceramic fiber is a promising candidate for all fiber based second-order nonlinear and photoluminescence applications. Moreover, the powder-in-tube reactive molten core method offers a more efficient and intrinsic contamination-free approach to fabricate glass–ceramic fibers. Full article
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Open AccessArticle
Europium-Doped Tellurite Glasses: The Eu2+ Emission in Tellurite, Adjusting Eu2+ and Eu3+ Emissions toward White Light Emission
Materials 2019, 12(24), 4140; https://doi.org/10.3390/ma12244140 - 10 Dec 2019
Abstract
Europium-doped magnesium tellurite glasses were prepared using melt quenching techniques and attenuated total reflection (ATR) spectroscopy was used to study the glass structure. The glass transition temperature increased with increasing MgO content. Eu2+ and Eu3+ emissions were studied using photoluminescence spectroscopy [...] Read more.
Europium-doped magnesium tellurite glasses were prepared using melt quenching techniques and attenuated total reflection (ATR) spectroscopy was used to study the glass structure. The glass transition temperature increased with increasing MgO content. Eu2+ and Eu3+ emissions were studied using photoluminescence spectroscopy (PL). The broad emission of Eu2+ ions centered at approximately 485 nm was found to decrease in intensity with increasing MgO content, while the Eu3+ emission was enhanced. The Eu3+ emission lay within the red orange range and its decay time was found to increase with increasing MgO content. Different excitation wavelengths were used to adjust Eu2+ to Eu3+ emissions to reach white light emission. The white light emission was obtained for the sample with the lowest MgO content under excitation in the near-UV range. Full article
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Open AccessArticle
Impact of Ag2O Content on the Optical and Spectroscopic Properties of Fluoro-Phosphate Glasses
Materials 2019, 12(21), 3516; https://doi.org/10.3390/ma12213516 - 26 Oct 2019
Abstract
Glasses with the system (84.60-x) NaPO3-5 ZnO-(9.40-x) NaF-x Ag2O-1 Er2O3, (x = 0, 2, 4, and 6) (mol%) were synthesized by the conventional melt-quenching method. The impact of the addition of Ag2O on [...] Read more.
Glasses with the system (84.60-x) NaPO3-5 ZnO-(9.40-x) NaF-x Ag2O-1 Er2O3, (x = 0, 2, 4, and 6) (mol%) were synthesized by the conventional melt-quenching method. The impact of the addition of Ag2O on the physical, thermal, structural, and optical properties of the glasses is discussed. The Judd-Oflet analysis was used to evaluate the radiative properties of the emission transitions of the glasses. The enhancement of luminescence properties due to Ag2O is discussed in terms of consequent changes in the local electromagnetic field, symmetry, and the ligand field around the Er3+ ion. The heat treatment of the glass was performed in order to precipitate Ag nanoparticles (NPs), which form as a layer at the surface of the heat-treated glasses as confirmed using scanning electron microscopy (SEM). The Ag NPs were found to increase the intensity of the emission at 1.5 µm. Full article
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Open AccessFeature PaperArticle
Insights and Aspects to the Modeling of the Molten Core Method for Optical Fiber Fabrication
Materials 2019, 12(18), 2898; https://doi.org/10.3390/ma12182898 - 07 Sep 2019
Cited by 3
Abstract
The molten core method (MCM) is a versatile technique to fabricate a wide variety of optical fiber core compositions ranging from novel glasses to crystalline semiconductors. One common feature of the MCM is an interaction between the molten core and softened glass cladding [...] Read more.
The molten core method (MCM) is a versatile technique to fabricate a wide variety of optical fiber core compositions ranging from novel glasses to crystalline semiconductors. One common feature of the MCM is an interaction between the molten core and softened glass cladding during the draw process, which often leads to compositional modification between the original preform and the drawn fiber. This causes the final fiber core diameter, core composition, and associated refractive index profile to vary over time and longitudinally along the fiber. Though not always detrimental to performance, these variations must, nonetheless, be anticipated and controlled as they directly impact fiber properties (e.g., numerical aperture, effective area). As an exemplar to better understand the underlying mechanisms, a silica-cladding, YAG-derived yttrium aluminosilicate glass optical fiber was fabricated and its properties (core diameter, silica concentration profile) were monitored as a function of draw time/length. It was found that diffusion-controlled dissolution of silica into the molten core agreed well with the observations. Following this, a set of first order kinetics equations and diffusion equation using Fick’s second law was employed as an initial effort to model the evolution of fiber core diameter and compositional profile with time. From these trends, further insights into other compositional systems and control schemes are provided. Full article
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Open AccessArticle
Study of Mid-Infrared Emission and Structural Properties of Heavy Metal Oxide Glass and Optical Fibre Co-Doped with Ho3+/Yb3+ Ions
Materials 2019, 12(8), 1238; https://doi.org/10.3390/ma12081238 - 15 Apr 2019
Abstract
Bismuth-germanate glasses with low hydroxide content co-doped with Ho3+/Yb3+ ions have been investigated in terms of structural and spectroscopic properties. To reduce OH- ions content and improve transmittance value at the wavelength of 3.1 µm, the glass synthesis has [...] Read more.
Bismuth-germanate glasses with low hydroxide content co-doped with Ho3+/Yb3+ ions have been investigated in terms of structural and spectroscopic properties. To reduce OH- ions content and improve transmittance value at the wavelength of 3.1 µm, the glass synthesis has been carried out in low vacuum conditions (45–65 mBar). The composition of the host glass based on heavy metal oxides affects the maximum phonon energy (hωmax = 724 cm−1), which low value has a positive impact on the mid-infrared emission parameters. Emission band at the wavelength of 2.87 µm was observed in glass co-doped with mol% 0.25 Ho2O3/0.75 Yb2O3 under 980 nm high power laser diode wavelength excitation. Lifetime measurements of the Yb3+:2F5/2 quantum level indicate efficient Yb3+ → Ho3+ energy transfer (η = 61%). The developed active bismuth-germanate glass was used as the core of optical fibre operating in the mid-infrared region. Full article
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