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Crystals
Special Issues
Luminescence Properties of Crystalline Materials
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Luminescence Properties of Crystalline Materials

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (31 July 2023) | Viewed by 2376

Special Issue Editor

Dr. David Stratos

E-Mail Website
Guest Editor
Department of Biomedical Engineering, University of West Attica, 12210 Athens, Greece
Interests: scintillating crystals and phosphor materials evaluation; medical imaging detectors; PET; SPECT; gamma-ray spectrometers
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Crystalline materials (scintillators and phosphors) are used in various applications mainly as radiation-converting media. A large number of research groups and groups of experts are currently working in the field and collaborate, combining their efforts in investigating fundamental properties and mechanisms as well as in an increasing variety of applications of luminescence phenomena, e.g., lighting sources—LEDs, laser sources, radiation detection systems, various luminescent screens, plasma displays, and display as well as image intensifiers.

Nowadays, research activity is directed towards mixed and co-doped inorganic phosphor materials, single crystals and optical ceramic materials, organic and hybrid crystals, nano-scintillators, quantum dots, and luminescent dopants, aiming to obtain higher luminescence performances, in accordance with the requirements of different applications.

The aim of this Special Issue is to collect contributions about the luminescence properties of crystalline materials, including growth production and experimental evaluations as well as theoretical calculations.

Dr. David Stratos
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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. Crystals is an international peer-reviewed open access monthly 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

  • luminescence
  • light yield
  • new inorganic scintillators
  • co-doped scintillators
  • mixed/hybrid scintillators
  • ceramic scintillators
  • hybrid crystalline materials
  • nanophosphors

Published Papers (2 papers)

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Research

16 pages, 4173 KiB  
Article
YAG:Ce Nanophosphors Synthesized by the Polymer–Salt Method for White LEDs with Isomorphic Substitution of Yttrium by Gadolinium
by Dmitry V. Bulyga, Diana A. Gavrilova, Sergey K. Evstropiev, Irina A. Arefina, Maxim K. Myagkih and Andrey A. Shelemanov
Crystals 2023, 13(8), 1156; https://doi.org/10.3390/cryst13081156 - 26 Jul 2023
Viewed by 741
Abstract
Fine-dispersed YGdAG:Ce nanopowders with various degrees of isomorphic substitution of yttrium by gadolinium were synthesized. The structure and luminescent properties were studied by X-ray diffraction, attenuated total reflection Fourier-transform infrared spectroscopy, luminescence spectroscopy and scanning electron microscopy. The possibility of synthesis of YGdAG:Ce [...] Read more.
Fine-dispersed YGdAG:Ce nanopowders with various degrees of isomorphic substitution of yttrium by gadolinium were synthesized. The structure and luminescent properties were studied by X-ray diffraction, attenuated total reflection Fourier-transform infrared spectroscopy, luminescence spectroscopy and scanning electron microscopy. The possibility of synthesis of YGdAG:Ce nanopowders with a degree of gadolinium substitution up to 60% and nanocrystals with average sizes of 25–30 nm were shown. The red-shift of the cerium luminescence band with an increase in Gd content was studied. The CIE diagram for emission of YGdAG:Ce synthesized by the polymer–salt method shows that the degree 30–40% substitution of Y by Gd is optimal for the fabrication of a white light source based on LED with an emission wavelength of 470 nm. Full article
(This article belongs to the Special Issue Luminescence Properties of Crystalline Materials)
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15 pages, 11071 KiB  
Article
Synthesis and Luminescence Properties of Green-to-Red Color-Tunable Upconverting K2Gd(PO4)(WO4):Yb3+,Tb3+,Eu3+ Phosphors
by Julija Grigorjevaite and Arturas Katelnikovas
Crystals 2023, 13(3), 479; https://doi.org/10.3390/cryst13030479 - 10 Mar 2023
Cited by 1 | Viewed by 1175
Abstract
Scientists are increasingly interested in new inorganic luminescence materials that could be excited with near-infrared (NIR) radiation. These materials can be used as luminescent thermometers, bio-imaging agents, anti-counterfeiting pigments, etc. In this manuscript, we report the synthesis and investigation of optical properties of [...] Read more.
Scientists are increasingly interested in new inorganic luminescence materials that could be excited with near-infrared (NIR) radiation. These materials can be used as luminescent thermometers, bio-imaging agents, anti-counterfeiting pigments, etc. In this manuscript, we report the synthesis and investigation of optical properties of two series of K2Gd(PO4)(WO4):20%Tb3+ (KGPW): the first, KGPW:20%Tb3+ doped with 1–20% Eu3+, and the second, KGPW:10%Yb3+,20%Tb3+ doped with 1–20% Eu3+. The phase-pure specimens were prepared using a solid-state synthesis method. Down-shifting and upconversion luminescence studies have been performed using 340 and 980 nm excitation, respectively. For upconversion emission luminescence, Yb3+ ions were used as sensitizers in the KGPW phosphors. In these phosphors, Yb3+ ions absorb the 980 nm radiation and transfer the energy to Tb3+ ions. At his point, Tb3+ ions either emit themselves or transfer part or all of their energy to Eu3+ ions. It was observed that the emission color of the synthesized phosphors could be successfully tuned from the green to red by varying the Tb/Eu concentration ratio regardless of the 340 or 980 nm excitation. Such color change proves that one luminescent material (KGPW) can provide three colors (i.e., green, orange, and red). Herein, the optical properties, such as reflection, down-shifting excitation and emission spectra, upconversion emission spectra, fluorescence lifetime, thermal quenching, color coordinates, and quantum efficiency, were studied using steady-state and kinetic spectroscopy. Full article
(This article belongs to the Special Issue Luminescence Properties of Crystalline Materials)
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