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Structural and Optical Studies of Eu3+ Doped Materials
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Structural and Optical Studies of Eu3+ Doped Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Physics".

Deadline for manuscript submissions: closed (20 November 2022) | Viewed by 10785

Special Issue Editor

Dr. Adam Watras

E-Mail Website
Guest Editor
Wlodzimierz Trzebiatowski Institute of Low Temperature and Structure Research of the Polish Academy of Sciences, Okolna 2, 50-422 Wroclaw, Poland
Interests: phosphors; luminescence; rare earth spectroscopy; transition metals spectroscopy; luminescence temperature quenching

Special Issue Information

Dear Colleagues,

Eu3+ doped phosphors have been known and studied for many years. Nonetheless, there are still new fields in which narrow red emission of europium can be used (pc-WLEDs, modern LCD screens, luminescence thermometers, etc.). On the other hand, Eu3+ ions are a great optical probe for subtle structural changes in materials. This feature is often used in the design and study of new luminescence materials.

Therefore, I would like to invite you to publish your results in this Special Issue of the Materials journal devoted to ‘Structural and Optical Studies of Eu3+ Doped Materials’. I believe that this issue will be a guide and review of novel materials, which use the unique and versatile properties of Eu3+ ions.

Dr. Adam Watras
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. 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

  • phosphors
  • optical probe
  • luminescence materials
  • rare earth spectroscopy

Published Papers (6 papers)

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Research

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17 pages, 5944 KiB  
Article
Luminescence Properties and Energy Transfer of Eu3+, Bi3+ Co-Doped LuVO4 Films Modified with Pluronic F-127 Obtained by Sol–Gel
by Brenely González-Penguelly, Grethell Georgina Pérez-Sánchez, Dulce Yolotzin Medina-Velázquez, Paulina Martínez-Falcón and Angel de Jesús Morales-Ramírez
Materials 2023, 16(1), 146; https://0-doi-org.brum.beds.ac.uk/10.3390/ma16010146 - 23 Dec 2022
Cited by 1 | Viewed by 1430
Abstract
Nowadays, orthovanadates are studied because of their unique properties for optoelectronic applications. In this work, the LuVO4:Eu3+, Bi3+ films were prepared by the sol–gel method, using a new simple route, and deposited by the dip-coating technique. The obtained [...] Read more.
Nowadays, orthovanadates are studied because of their unique properties for optoelectronic applications. In this work, the LuVO4:Eu3+, Bi3+ films were prepared by the sol–gel method, using a new simple route, and deposited by the dip-coating technique. The obtained films are transparent, fracture-free, and homogenous. The sol–gel process was monitored by Fourier-transform infrared spectroscopy (FTIR), and according to X-ray diffraction (XRD) results, the crystal structure was tetragonal, and films that were highly oriented along the (200) low-energy direction were obtained. The morphological studies by scanning electron microscopy (SEM) showed uniformly distributed circular agglomerations of rice-like particles with nanometric sizes. The luminescence properties of the films were analyzed using a fixed concentration of 2.5 at. % Eu3+ and different concentrations of Bi3+ (0.5, 1.0, and 1.5 at. %); all the samples emit in red, and it has been observed that the light yield of Eu3+ is enhanced as the Bi3+ content increases when the films are excited at 350 nm, which corresponds to the 1S0→3P1 transition of Bi3+. Therefore, a highly efficient energy transfer mechanism between Bi3+ and Eu3+ has been observed, reaching up to 71%. Finally, it was established that this energy transfer process occurs via a quadrupole–quadrupole interaction. Full article
(This article belongs to the Special Issue Structural and Optical Studies of Eu3+ Doped Materials)
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13 pages, 2769 KiB  
Article
Eu3+ and Tb3+ @ PSQ: Dual Luminescent Polyhedral Oligomeric Polysilsesquioxanes
by Stefano Marchesi, Ivana Miletto, Chiara Bisio, Enrica Gianotti, Leonardo Marchese and Fabio Carniato
Materials 2022, 15(22), 7996; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15227996 - 12 Nov 2022
Cited by 2 | Viewed by 1389
Abstract
The synthesis and characterization of novel luminescent amorphous POSS-based polysilsesquioxanes (PSQs) with Tb3+ and Eu3+ ions directly integrated in the polysilsesquioxane matrix is presented. Two different Tb3+/Eu3+ molar ratios were applied, with the aim of disclosing the relationships [...] Read more.
The synthesis and characterization of novel luminescent amorphous POSS-based polysilsesquioxanes (PSQs) with Tb3+ and Eu3+ ions directly integrated in the polysilsesquioxane matrix is presented. Two different Tb3+/Eu3+ molar ratios were applied, with the aim of disclosing the relationships between the nature and loading of the ions and the luminescence properties. Particular attention was given to the investigation of site geometry and hydration state of the metal centers in the inorganic framework, and of the effect of the Tb3+ → Eu3+ energy transfer on the overall optical properties of the co-doped materials. The obtained materials were characterized by high photostability and colors of the emitted light ranging from orange to deep red, as a function of both the Tb3+/Eu3+ molar ratio and the chosen excitation wavelength. A good energy transfer was observed, with higher efficiency displayed when donor/sensitizer concentration was lower than the acceptor/activator concentration. The easiness of preparation and the possibility to finely tune the photoluminescence properties make these materials valid candidates for several applications, including bioimaging, sensors, ratiometric luminescence-based thermometers, and optical components in inorganic or hybrid light-emitting devices. Full article
(This article belongs to the Special Issue Structural and Optical Studies of Eu3+ Doped Materials)
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11 pages, 23466 KiB  
Article
Structural and Luminescence Behavior of Nanocrystalline Orthophosphate KMeY(PO4)2: Eu3+ (Me = Ca, Sr) Synthesized by Hydrothermal Method
by Aleksandra J. Pelczarska, Dagmara Stefańska, Adam Watras, Lucyna Macalik, Irena Szczygieł and Jerzy Hanuza
Materials 2022, 15(5), 1850; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15051850 - 01 Mar 2022
Cited by 4 | Viewed by 1540
Abstract
KMeY(PO4)2:5% Eu3+ phosphates have been synthesized by a novel hydrothermal method. Spectroscopic, structural, and morphological properties of the obtained samples were investigated by X-ray, TEM, Raman, infrared, absorption, and luminescence studies. The microscopic analysis of the [...] Read more.
KMeY(PO4)2:5% Eu3+ phosphates have been synthesized by a novel hydrothermal method. Spectroscopic, structural, and morphological properties of the obtained samples were investigated by X-ray, TEM, Raman, infrared, absorption, and luminescence studies. The microscopic analysis of the obtained samples showed that the mean diameter of synthesized crystals was about 15 nm. The KCaY(PO4)2 and KSrY(PO4)2 compounds were isostructural and they crystallized in a rhabdophane-type hexagonal structure with the unit-cell parameters a = b ≈ 6.90 Å, c ≈ 6.34 Å, and a = b ≈ 7.00 Å, c ≈ 6.42 Å for the Ca and Sr compound, respectively. Spectroscopic investigations showed intense 5D0 → 7F4 transitions connected with D2 site symmetry of Eu3+ ions. Furthermore, for the sample annealed at 500 °C, europium ions were located in two optical sites, on the surface of grains and in the bulk. Thermal treatment of powders at high temperature provided better grain crystallinity and only one position of dopant in the crystalline structure. The most intense emission was possessed by the KSrY(PO4)2:5% Eu3+ sample calcinated at 500 °C. Full article
(This article belongs to the Special Issue Structural and Optical Studies of Eu3+ Doped Materials)
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13 pages, 14121 KiB  
Article
In Situ Monitoring of Pulsed Laser Annealing of Eu-Doped Oxide Thin Films
by Michal Novotný, Jan Remsa, Šárka Havlová, Joris More-Chevalier, Stefan Andrei Irimiciuc, Sergii Chertopalov, Petr Písařík, Lenka Volfová, Přemysl Fitl, Tomáš Kmječ, Martin Vrňata and Ján Lančok
Materials 2021, 14(24), 7576; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14247576 - 09 Dec 2021
Cited by 4 | Viewed by 2035
Abstract
Eu3+-doped oxide thin films possess a great potential for several emerging applications in optics, optoelectronics, and sensors. The applications demand maximizing Eu3+ photoluminescence response. Eu-doped ZnO, TiO2, and Lu2O3 thin films were deposited by Pulsed Laser [...] Read more.
Eu3+-doped oxide thin films possess a great potential for several emerging applications in optics, optoelectronics, and sensors. The applications demand maximizing Eu3+ photoluminescence response. Eu-doped ZnO, TiO2, and Lu2O3 thin films were deposited by Pulsed Laser Deposition (PLD). Pulsed UV Laser Annealing (PLA) was utilized to modify the properties of the films. In situ monitoring of the evolution of optical properties (photoluminescence and transmittance) at PLA was realized to optimize efficiently PLA conditions. The changes in optical properties were related to structural, microstructural, and surface properties characterized by X-ray diffraction (XRD) and atomic force microscopy (AFM). The substantial increase of Eu3+ emission was observed for all annealed materials. PLA induces crystallization of TiO2 and Lu2O3 amorphous matrix, while in the case of already nanocrystalline ZnO, rather surface smoothening0related grains’ coalescence was observed. Full article
(This article belongs to the Special Issue Structural and Optical Studies of Eu3+ Doped Materials)
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20 pages, 12754 KiB  
Article
Strontium Phosphate Composite Designed to Red-Emission at Different Temperatures
by Katarzyna Szyszka, Adam Watras and Rafal J. Wiglusz
Materials 2020, 13(20), 4468; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13204468 - 09 Oct 2020
Cited by 7 | Viewed by 1724
Abstract
Eu3+-doped Sr10(PO4)6(OH)2–Sr3(PO4)2 (SrHAp-TSP) composites were obtained via the microwave-stimulated hydrothermal method and post-heat-treated from 750 to 950 °C. Concentration of the Eu3+ ions was set to be [...] Read more.
Eu3+-doped Sr10(PO4)6(OH)2–Sr3(PO4)2 (SrHAp-TSP) composites were obtained via the microwave-stimulated hydrothermal method and post-heat-treated from 750 to 950 °C. Concentration of the Eu3+ ions was set to be 0.5, 1, 2, 3, 5 mol% in a ratio of the strontium ions molar content. The structural and morphological properties were investigated by X-ray powder diffraction (XRPD), scanning electron microscopy (SEM) and fourier transform infrared spectroscopy (FT-IR) techniques. The average particle size of the studied materials annealed at 750, 850 and 950 °C were counted about 100, 131 and 173 nm, respectively. The luminescence properties depending on the dopant ion concentration, heat-treatment temperature, excitation wavelength and temperature were investigated. In the emission spectra, a broad peak corresponding to the 4f65d1 → 4f7 (8S7/2) emission of Eu2+ ions as well as narrow 4f-4f transitions typical for Eu3+ ions can be observed. The luminescence intensity of the 1 mol% Eu3+:Sr10(PO4)6(OH)2–Sr3(PO4)2 was measured depending on the ambient temperature in the range of 80–550 K. The CIE 1931 (International Commission on Illumination) chromaticity diagram was determined from emission spectra measured in 80, 300 and 550 K. The reduction mechanism of the Eu3+ to the Eu2+ was explained by the charge compensation mechanism based on the Kröger–Vink-notation. The decay times were measured and the Judd–Ofelt (J–O) theory was applied to analyze the observed structural and spectroscopic features. Full article
(This article belongs to the Special Issue Structural and Optical Studies of Eu3+ Doped Materials)
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Review

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11 pages, 5081 KiB  
Review
Eu3+ as a Powerful Structural and Spectroscopic Tool for Glass Photonics
by Thi Ngoc Lam Tran, Alessandro Chiasera, Anna Lukowiak and Maurizio Ferrari
Materials 2022, 15(5), 1847; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15051847 - 01 Mar 2022
Cited by 8 | Viewed by 1836
Abstract
The unique properties of the Eu3+ ion make it a powerful spectroscopic tool to investigate structure or follow processes and mechanisms in several high-tech application areas such as biology and health, structural engineering, environment monitoring systems and quantum technology, mainly concerning photonics. [...] Read more.
The unique properties of the Eu3+ ion make it a powerful spectroscopic tool to investigate structure or follow processes and mechanisms in several high-tech application areas such as biology and health, structural engineering, environment monitoring systems and quantum technology, mainly concerning photonics. The traditional method is to exploit the unique photoluminescent properties of Eu3+ ions to understand complex dynamical processes and obtain information useful to develop materials with specific characteristics. The objective of this review is to focus on the use of Eu3+ optical spectroscopy in some condensed matter issues. After a short presentation of the more significant properties of the Eu3+ ion, some examples regarding its use as a probe of the local structure in sol–gel systems are presented. Another section is devoted to dynamical processes such as the important technological role of nanocrystals as rare-earth sensitizers. The appealing effect of the site-selection memory, observed when exciting different sites into the 5D1 state, which the 5D0 → 7F0 emission band reflects following the sites’ distribution, is also mentioned. Finally, a section is devoted to the use of Eu3+ in the development of a rare-earth-based platform for quantum technologies. Full article
(This article belongs to the Special Issue Structural and Optical Studies of Eu3+ Doped Materials)
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