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Rare Earth Based Luminescent Materials
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Rare Earth Based Luminescent Materials

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Photochemistry".

Deadline for manuscript submissions: 30 November 2024 | Viewed by 3205

Special Issue Editors

Dr. Joana Zaharieva

E-Mail Website
Guest Editor
Faculty of Chemistry and Pharmacy, Sofia University, Sofia, Bulgaria
Interests: coordination chemistry; rare earth complexes; immobilization matrices; photoluminescence
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Dimitar Todorovsky

E-Mail Website
Guest Editor
Faculty of Chemistry and Pharmacy, Sofia University, Sofia, Bulgaria
Interests: fine inorganic synthesis; rare earth chemistry; photocatalysis; thin films; nuclear chemistry
Prof. Dr. Maria Milanova

E-Mail Website
Guest Editor
Faculty of Chemistry and Pharmacy, Sofia University, Sofia, Bulgaria
Interests: inorganic chemistry; material science; chemistry of rare earths; photocatalysis; environmental problems
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The intensive research work in the field of luminescent materials with lanthanides, resulting in a large number of articles published on the subject, shows that the interest in these materials is far from exhausted. This is due to the remarkable properties and fascinating applications of these materials. Optical telecommunications, luminescent displays, and white LEDs, as well as various biomedical applications, are just a few to be mentioned. This Special Issue aims to demonstrate the recent trends in the research on luminescent materials based on lanthanides. The synthesis, properties, and applications of these materials, as well as fundamental studies and design, are a matter of importance.

The scope of the Special Issue is rather wide-ranging, covering both lanthanide complexes, and organic, inorganic, and organic-inorganic hybrid materials with advanced luminescent properties. The scientific community, researchers, and experts are challenged and highly welcome to present both original papers and short communications, as well as reviews, in this Special Issue.

Dr. Joana Zaharieva
Prof. Dr. Dimitar Todorovsky
Prof. Dr. Maria Milanova
Guest Editors

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. Molecules 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 2700 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

  • lanthanides
  • rare earth
  • complexes
  • luminescence
  • inorganic materials
  • hybrid materials
  • composite materials
  • metal-organic frameworks
  • phosphors
  • sensors

Published Papers (4 papers)

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Research

22 pages, 28263 KiB  
Article
Investigation of the Sensing Properties of Lanthanoid Metal–Organic Frameworks (Ln-MOFs) with Terephthalic Acid
by Denitsa Elenkova, Yana Dimitrova, Martin Tsvetkov, Bernd Morgenstern, Maria Milanova, Dimitar Todorovsky and Joana Zaharieva
Molecules 2024, 29(15), 3713; https://doi.org/10.3390/molecules29153713 - 5 Aug 2024
Viewed by 375
Abstract
The solvothermal synthesis of LnCl3.nH2O with terephthalic acid (benzene-1,4-dicarboxylic acid, H2BDC) produced metal–organic frameworks (LnBDC), [Ln2(BDC)3(H2O)4]∞, where Ln = Sm, Eu, Tb, and Dy. The materials [...] Read more.
The solvothermal synthesis of LnCl3.nH2O with terephthalic acid (benzene-1,4-dicarboxylic acid, H2BDC) produced metal–organic frameworks (LnBDC), [Ln2(BDC)3(H2O)4]∞, where Ln = Sm, Eu, Tb, and Dy. The materials obtained were characterized by a number of physico-chemical techniques. The influence of the ionic radius of the lanthanides on the microstructural characteristics of the Ln-MOFs was evaluated by performing Rietveld refinement. The MOFs obtained were tested as fluorescent sensors for numerous cations and anions in water. The highly luminescent EuBDC and TbBDC demonstrated multi-responsive luminescence sensing functions to detect Ag(I), Fe(III), Cr(III), and Cr(VI), which are essential for their environmental applications. By applying the non-linear Stern–Volmer equation, the fluorescent quenching mechanism was determined. The stability of the obtained materials in water in a wide pH range (acidity pH = 4 and alkalinity pH = 9 solutions) was confirmed. Full article
(This article belongs to the Special Issue Rare Earth Based Luminescent Materials)
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14 pages, 25168 KiB  
Article
Glass-Ceramic Materials with Luminescent Properties in the System ZnO-B2O3-Nb2O5-Eu2O3
by Lyubomir Aleksandrov, Aneliya Yordanova, Margarita Milanova, Reni Iordanova, Peter Tzvetkov, Pavel Markov and Petia Petrova
Molecules 2024, 29(15), 3452; https://doi.org/10.3390/molecules29153452 - 23 Jul 2024
Viewed by 383
Abstract
In this paper, the crystallization behavior of 50ZnO:47B2O3:3Nb2O3:0.5Eu2O3 (G-0 h) glass has been investigated in detail by DSC, XRD and TEM analysis. The luminescent properties of the resulting glass-ceramics were also investigated. [...] Read more.
In this paper, the crystallization behavior of 50ZnO:47B2O3:3Nb2O3:0.5Eu2O3 (G-0 h) glass has been investigated in detail by DSC, XRD and TEM analysis. The luminescent properties of the resulting glass-ceramics were also investigated. By XRD and TEM analysis, crystallization of several crystalline phases has been proved (α-Zn3B2O6, β-Zn3B2O6 and ZnNb2O6). By calculating crystal parameters, it was found that europium ions are successfully incorporated in the β-Zn3B2O6. Photo-luminescent spectra showed increased emission in the resulting glass-ceramic samples compared to the parent glass sample due to higher asymmetry of Eu3+ ions in the obtained crystalline phases. It was established that the optimum emission intensity is registered for glass-ceramic samples obtained after 25 h heat treatment of the parent glass. Full article
(This article belongs to the Special Issue Rare Earth Based Luminescent Materials)
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13 pages, 4011 KiB  
Article
Spectroscopic and Thermographic Qualities of Praseodymium-Doped Oxyfluorotellurite Glasses
by Barbara Klimesz, Witold Ryba-Romanowski and Radosław Lisiecki
Molecules 2024, 29(13), 3041; https://doi.org/10.3390/molecules29133041 - 26 Jun 2024
Viewed by 721
Abstract
The thermal stability of oxyfluorotellurite glass systems, (65-x)TeO2-20ZnF2-12PbO-3Nb2O5-xPr2O3, doped with praseodymium was examined. The different concentrations of praseodymium oxide (x = 0.5 and 2 mol%) were applied to verify the thermal, [...] Read more.
The thermal stability of oxyfluorotellurite glass systems, (65-x)TeO2-20ZnF2-12PbO-3Nb2O5-xPr2O3, doped with praseodymium was examined. The different concentrations of praseodymium oxide (x = 0.5 and 2 mol%) were applied to verify the thermal, optical and luminescence properties of the materials under study. The relatively high values of the Dietzel (ΔT) and Saad–Poulain (S or H′) thermal stability factors determined using a differential thermal analysis (DTA) indicate the good thermal stability of the glass matrix, which gradually improves with the content of the active dopant. The temperature dependence of optical spectra in the temperature range 300–675 K for the VIS–NIR region was investigated. The involved Pr3+ optical transition intensities and relaxation dynamic of the praseodymium luminescent level were determined. The ultrashort femtosecond pulses were utilized to examine a dynamic relaxation of the praseodymium luminescent levels. Although the measured emission of the Pr3+ active ions in the studied glass encompasses the quite broad spectral region, the observed luminescence may only be attributed to 3PJ excited states. As a result, the observed decrease in the experimental lifetime for the 3P0 level along with the increasing activator content was identified as an intensification of the Pr–Pr interplay and the associated self-quenching process. The maximum relative sensitivities (Sr) estimated over a relatively wide temperature range are ~0.46% K−1 (at 300 K) for FIR (I530/I497) and 0.20% K−1 (at 600 K) for FIR (I630/I497), which seems to confirm the possibility of using investigated glasses in optical temperature sensors. Full article
(This article belongs to the Special Issue Rare Earth Based Luminescent Materials)
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16 pages, 7274 KiB  
Article
Microcrystalline Luminescent (Eu1-xLnx)2bdc3·nH2O (Ln = La, Gd, Lu) Antenna MOFs: Effect of Dopant Content on Structure, Particle Morphology, and Luminescent Properties
by Stefaniia S. Kolesnik, Nikita A. Bogachev, Ilya E. Kolesnikov, Sergey N. Orlov, Mikhail N. Ryazantsev, Gema González, Mikhail Yu. Skripkin and Andrey S. Mereshchenko
Molecules 2024, 29(2), 532; https://doi.org/10.3390/molecules29020532 - 21 Jan 2024
Viewed by 971
Abstract
In this work, three series of micro-sized heterometallic europium-containing terephthalate MOFs, (Eu1-xLnx)2bdc3·nH2O (Ln = La, Gd, Lu), are synthesized via an ultrasound-assisted method in an aqueous medium. La3+ and Gd3+-doped [...] Read more.
In this work, three series of micro-sized heterometallic europium-containing terephthalate MOFs, (Eu1-xLnx)2bdc3·nH2O (Ln = La, Gd, Lu), are synthesized via an ultrasound-assisted method in an aqueous medium. La3+ and Gd3+-doped terephthalates are isostructural to Eu2bdc3·4H2O. Lu3+-doped compounds are isostructural to Eu2bdc3·4H2O with Lu contents lower than 95 at.%. The compounds that are isostructural to Lu2bdc3·2.5H2O are formed at higher Lu3+ concentrations for the (Eu1-xLux)2bdc3·nH2O series. All materials consist of micrometer-sized particles. The particle shape is determined by the crystalline phase. All the synthesized samples demonstrate an “antenna” effect: a bright-red emission corresponding to the 5D0-7FJ transitions of Eu3+ ions is observed upon 310 nm excitation into the singlet electronic excited state of terephthalate ions. The fine structure of the emission spectra is determined by the crystalline phase due to the different local symmetries of the Eu3+ ions in the different kinds of crystalline structures. The photoluminescence quantum yield and 5D0 excited state lifetime of Eu3+ are equal to 11 ± 2% and 0.44 ± 0.01 ms, respectively, for the Ln2bdc3·4H2O structures. For the (Eu1-xLux)2bdc3·2.5H2O compounds, significant increases in the photoluminescence quantum yield and 5D0 excited state lifetime of Eu3+ are observed, reaching 23% and 1.62 ms, respectively. Full article
(This article belongs to the Special Issue Rare Earth Based Luminescent Materials)
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