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Glasses and Ceramics for Luminescence Applications (2nd Edition)

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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: 20 May 2024 | Viewed by 1794

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Special Issue Editor

Dr. Haohong Chen

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Guest Editor

Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China
Interests: transparent ceramics; luminescent glass; PiG; nano-phosphor; crystal structure determination; material calculation and simulation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Luminescent glasses and ceramics are used in many applications, such as illumination, display, telecommunication, medical diagnosis, security checks, lasers, nuclear fusion, and other fields, playing many roles in our daily life, culture and development.

Different from phosphor also called as (opaque or normal) ceramics sometimes in terms of their polycrystalline character, luminescent blocks like glasses, transparent ceramics, and single crystals have excellent transparence and fewer defects, which is important for applications beyond illumination and display. Additionally glasses and ceramics are better than single crystals in terms of time and cost of fabrication as well as uniformity, variety, and high concentration.

The aim of this Special Issue is to focus on the latest developments in luminescent glasses and ceramics including novel structures, luminescent centers and mechanisms, architectures or frameworks of packaged devices (e.g., LD/LED and detectors), techniques, methods, and applications. We are mainly interested in advanced materials with excellent luminescent properties, but others that are useful for material developments such as novel designs for measurement, calculation, and unconventional application are also welcome.

We believe that this collection will present recent interesting and important results that could be useful for young investigators and leading experts in the field. It will also be helpful for people with an interest in novel luminescent materials with advanced properties and potential applications in their projects.

We would like to thank the authors for their contributions to the 1st edition. The 1st edition and the attached papers can be found here: https://0-www-mdpi-com.brum.beds.ac.uk/journal/materials/special_issues/glass_ceramic_lumi.

Dr. Haohong Chen
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

luminescent glass and ceramics
process–structure–property relationships
calculation and simulation
advanced manufacturing or measurement technology
innovative luminescent applications

Related Special Issue

Glasses and Ceramics for Luminescence Applications in Materials (10 articles)

Published Papers (3 papers)

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Research

12 pages, 3716 KiB

Open AccessArticle

Spinel-Based ZnAl₂O₄: 0.5%Cr³⁺ Red Phosphor Ceramics for WLED

by Wenchao Ji, Xueke Xu, Ming Qiang and Aihuan Dun

Materials 2024, 17(7), 1610; https://0-doi-org.brum.beds.ac.uk/10.3390/ma17071610 - 01 Apr 2024

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Abstract

To address the issue of the lack of red light in traditional Ce³⁺: YAG-encapsulated blue LED white light systems, we utilized spark plasma sintering (SPS) to prepare spinel-based Cr³⁺-doped red phosphor ceramics. Through phase and spectral analysis, the SPS-sintered ZnAl₂O₄: 0.5%Cr³⁺ phosphor ceramic exhibits good density, and Cr³⁺ is incorporated into [AlO₆] octahedra as a red emitting center. We analyzed the reasons behind the narrow-band emission and millisecond-level lifetime of ZAO: 0.5%Cr³⁺, attributing it to the four-quadrupole interaction mechanism as determined through concentration quenching modeling. Additionally, we evaluated the thermal conductivity and thermal quenching performance of the ceramic. The weak electron-phonon coupling (EPC) effects and emission from antisite defects at 699 nm provide positive assistance in thermal quenching. At a high temperature of 150 °C, the thermal conductivity reaches up to 14 W·m⁻¹·K⁻¹, and the 687 nm PL intensity is maintained at around 70% of room temperature. Furthermore, the internal quantum efficiency (IQE) of ZAO: 0.5%Cr³⁺ phosphor ceramic can reach 78%. When encapsulated with Ce³⁺: YAG for a 450 nm blue LED, it compensates for the lack of red light, adjusts the color temperature, and improves the color rendering index (R9). This provides valuable insights for the study of white light emitting diodes (WLEDs). Full article

(This article belongs to the Special Issue Glasses and Ceramics for Luminescence Applications (2nd Edition))

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16 pages, 9603 KiB

Open AccessArticle

Preparation of Ce-Doped Gd₃(Al, Ga)₅O₁₂ Nanopowders via Microwave-Assisted Homogenization Precipitation for Transparent Ceramic Scintillators

by Min Liu, Yansen Zhang, Song Hu, Guohong Zhou, Xianpeng Qin and Shiwei Wang

Materials 2024, 17(6), 1258; https://0-doi-org.brum.beds.ac.uk/10.3390/ma17061258 - 08 Mar 2024

Viewed by 498

Abstract

Ce-doped gadolinium gallium aluminum oxide (Ce: GGAG) precursors were first prepared by the microwave-assisted homogeneous precipitation method (MAHP). Thermal gravity-differential thermal analysis (TG-DTA), X-ray diffraction (XRD), specific surface area analysis (BET) and field emission scanning electron microscopy (FE-SEM) were employed to investigate the crystal structure, phase evolution and morphologies of the Ce: GGAG precursors and powders. The influence of Ga ion concentration in the salt solution on the properties of Ce: GGAG powders was investigated. All the precursors were transformed into single-phase GGAG after being calcined at 950 °C in a furnace for 3 h. Monodispersed Ce: GGAG powders were obtained as the Ga ion concentration was lower than 0.06 mol/L. Single-phase and dense Ce: GGAG ceramics were obtained after sintering at 1600 °C in a flowing oxygen atmosphere for 10 h. Specifically, the Ce: GGAG ceramic reached its maximum density of ~6.68 g/cm³, which was close to its theoretical density of 6.70 g/cm³, and exhibited the highest optical transmittance of 65.2% at 800 nm after hot isostatic pressing sintering (HIP) as the Ga ion concentration was 0.02 mol/L. The decay time and light yield of the GGAG ceramic were 35 ns and 35,000 ± 1250 ph/MeV, respectively, suggesting that Ce: GGAG ceramics prepared using MAHP-synthesized nanopowders are promising for scintillation applications. Full article

(This article belongs to the Special Issue Glasses and Ceramics for Luminescence Applications (2nd Edition))

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10 pages, 2051 KiB

Open AccessArticle

Fabrication and Luminescence Properties of Highly Transparent Green-Emitting Ho:Y₂O₃ Ceramics for Laser Diode Lighting

by Yan Liu, Xianpeng Qin, Lin Gan, Guohong Zhou, Song Hu, Zhengjuan Wang, Juan Jiang, Tianjin Zhang and Hetuo Chen

Materials 2024, 17(2), 402; https://0-doi-org.brum.beds.ac.uk/10.3390/ma17020402 - 13 Jan 2024

Viewed by 594

Abstract

Highly transparent Ho:Y₂O₃ ceramics for laser diode lighting were prepared using the vacuum sintering method with 0.3 at.% Nb₂O₅ as a sintering additive. The microstructures, transmittance, and luminescence properties of the Ho:Y₂O₃ ceramic samples were investigated in detail. The transmittance levels of all samples with various Ho³⁺ concentrations reached ~81.5% (2 mm thick) at 1100 nm. Under the excitation of 363 nm (ultraviolet) or 448 nm (blue) light, Ho:Y₂O₃ transparent ceramic samples showed that green emission peaked at 550 nm. The emission intensity was strongly affected by the concentration of Ho³⁺ ions, reaching its highest level in the sample doped with 1 at.% Ho³⁺. The CIE coordinates of the luminescence were in the green region (i.e., the CIE coordinates of the sample doped with 1 at.% Ho³⁺ were [0.27, 0.53] and [0.30, 0.69], under the excitation of 363 nm and 448 nm light, respectively). The possibility of its application as laser diode lighting was reported. Under the excitation of 450 nm blue laser, the sample doped with 0.5 at.% Ho³⁺ had the best performance: the saturated luminous flux, lumen efficiency, and the luminescence saturation power densities were 800 lm, 57.7 lm/W, and 17.6 W/mm², respectively. Furthermore, the materials have high thermal conductivity and mechanical strength due to their host of rare-earth sesquioxide. Thus, Ho:Y₂O₃ transparent ceramics are expected to be a promising candidate for green-light-emitting devices for solid-state lighting, such as laser diode lighting. Full article

(This article belongs to the Special Issue Glasses and Ceramics for Luminescence Applications (2nd Edition))

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