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Inorganic Luminescent Materials: From Fundamental to Applications
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Inorganic Luminescent Materials: From Fundamental to Applications

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

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 14038

Special Issue Editors

Prof. Dr. Lidia Armelao

E-Mail Website
Guest Editor
1. Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
2. Institute of Condensed Matter Chemistry and Technologies for Energy, National Research Council, Corso Stati Uniti 4, 35127 Padova, Italy
Interests: inorganic nanostructures and films; functional surfaces; sol-gel; lanthanide complexes; luminescence; metallo-supramolecular systems
Dr. Jorge H. Monteiro

E-Mail
Co-Guest Editor
Department of Chemistry, Humboldt State University, Arcata, CA, USA
Interests: lanthanides; luminescence; luminescence sensing; singlet oxygen generation; bioimaging

Special Issue Information

Dear Colleagues,

Inorganic luminescent materials are substances that convert an incident energy input into the emission of electromagnetic waves in the ultraviolet (UV), visible, or infrared regions of the spectrum. In recent decades, many luminescent materials based on rare-earth ions or rare-earth based host lattices have been invented and applied widely. Major applications are in emissive displays, fluorescent lamps and LEDs, and systems to detect X-rays or γ-rays, which are used, for example, in medical imaging.

The aim of the Special Issue is to highlight new advances in the field of inorganic luminescent materials, from fundamental aspects through to applications. Both comprehensive reviews or original papers on basic research or applied technologies of promising luminescent materials are welcomed.

Prof. Dr. Lidia Armelao
Dr. Jorge H. Monteiro
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

  • Luminescence
  • Phosphor
  • Luminescent material
  • Quantum dots
  • LED
  • Rare-earth ions
  • Spectral-converting materials
  • Lanthanides

Published Papers (5 papers)

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Research

28 pages, 16116 KiB  
Article
Structural and Optical Properties of Pure and Sulfur-Doped Silicate–Phosphate Glass
by Justyna Sułowska, Dominika Madej, Bartłomiej Pokrzywka, Magdalena Szumera and Andrzej Kruk
Molecules 2021, 26(11), 3263; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules26113263 - 28 May 2021
Cited by 4 | Viewed by 2259
Abstract
A series of silicate–phosphate glass materials from the SiO2-P2O5-K2O-MgO system (pure and doped with sulfur ions) were synthesized by melting raw material mixtures that contained activated carbon as a reducer. The bulk composition of glass [...] Read more.
A series of silicate–phosphate glass materials from the SiO2-P2O5-K2O-MgO system (pure and doped with sulfur ions) were synthesized by melting raw material mixtures that contained activated carbon as a reducer. The bulk composition of glass was confirmed with X-ray fluorescence spectroscopy. The homogeneity of the glass was confirmed through elemental mapping at the microstructural level with scanning electron microscopy combined with an analysis of the microregions with energy-dispersive X-ray spectroscopy. The structural and optical properties of the glass were studied by using spectroscopic techniques. The infrared spectroscopy studies that were conducted showed that the addition of sulfur caused changes in the silicate–phosphate networks, as they became more polymerized, which was likely related to the accumulation of potassium near the sulfur ions. By using irradiation with an optical parametric oscillator (OPO) nanosecond laser system operating at the second harmonic wavelength, the glass samples emitted a wide spectrum of luminescence, peaking at about 700 nm when excited by UV light (210–280 nm). The influence of the glass composition and the laser-processing parameters on the emission characteristics is presented and discussed. This work also referred to the density, molar volume, and theoretical optical basicity of pure and sulfur-doped glass. Full article
(This article belongs to the Special Issue Inorganic Luminescent Materials: From Fundamental to Applications)
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15 pages, 2767 KiB  
Article
Mono- and Mixed Metal Complexes of Eu3+, Gd3+, and Tb3+ with a Diketone, Bearing Pyrazole Moiety and CHF2-Group: Structure, Color Tuning, and Kinetics of Energy Transfer between Lanthanide Ions
by Victoria E. Gontcharenko, Mikhail A. Kiskin, Vladimir D. Dolzhenko, Vladislav M. Korshunov, Ilya V. Taydakov and Yury A. Belousov
Molecules 2021, 26(9), 2655; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules26092655 - 01 May 2021
Cited by 22 | Viewed by 3920
Abstract
Three novel lanthanide complexes with the ligand 4,4-difluoro-1-(1,5-dimethyl-1H-pyrazol-4-yl)butane-1,3-dione (HL), namely [LnL3(H2O)2], Ln = Eu, Gd and Tb, were synthesized, and, according to single-crystal X-ray diffraction, are isostructural. The photoluminescent properties of these compounds, as well as of [...] Read more.
Three novel lanthanide complexes with the ligand 4,4-difluoro-1-(1,5-dimethyl-1H-pyrazol-4-yl)butane-1,3-dione (HL), namely [LnL3(H2O)2], Ln = Eu, Gd and Tb, were synthesized, and, according to single-crystal X-ray diffraction, are isostructural. The photoluminescent properties of these compounds, as well as of three series of mixed metal complexes [EuxTb1-xL3(H2O)2] (EuxTb1-xL3), [EuxGd1-xL3(H2O)2] (EuxGd1-xL3), and [GdxTb1-xL3(H2O)2] (GdxTb1-xL3), were studied. The EuxTb1-xL3 complexes exhibit the simultaneous emission of both Eu3+ and Tb3+ ions, and the luminescence color rapidly changes from green to red upon introducing even a small fraction of Eu3+. A detailed analysis of the luminescence decay made it possible to determine the observed radiative lifetimes of Tb3+ and Eu3+ and estimate the rate of excitation energy transfer between these ions. For this task, a simple approximation function was proposed. The values of the energy transfer rates determined independently from the luminescence decays of terbium(III) and europium(III) ions show a good correlation. Full article
(This article belongs to the Special Issue Inorganic Luminescent Materials: From Fundamental to Applications)
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16 pages, 3539 KiB  
Article
Thermal and Emission Properties of a Series of Lanthanides Complexes with N-Biphenyl-Alkylated-4-Pyridone Ligands: Crystal Structure of a Terbium Complex with N-Benzyl-4-Pyridone
by Florentina L. Chiriac, Monica Iliş, Augustin Madalan, Doina Manaila-Maximean, Mihail Secu and Viorel Cîrcu
Molecules 2021, 26(7), 2017; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules26072017 - 01 Apr 2021
Cited by 4 | Viewed by 2068
Abstract
This work focuses on the investigation of the liquid crystalline behavior and luminescence properties of the lanthanide complexes of Eu(III), Sm(III) and Tb(III) with N-biphenyl-alkylated-4-pyridone ligands. The organic ligands having a biphenyl group attached via a long flexible spacer with either 9 [...] Read more.
This work focuses on the investigation of the liquid crystalline behavior and luminescence properties of the lanthanide complexes of Eu(III), Sm(III) and Tb(III) with N-biphenyl-alkylated-4-pyridone ligands. The organic ligands having a biphenyl group attached via a long flexible spacer with either 9 or 10 carbon atoms were synthesized by the reaction between 4-hydroxypyridine and the corresponding bromide compounds. The chemical structures of the organic and lanthanide complexes were assigned based on elemental analysis, single-crystal X-ray diffraction, 1H, 13C NMR and IR spectroscopies, and thermogravimetric analysis (TGA). The X-ray diffraction analysis of a parent compound shows that the lanthanide ions are surrounded by three monodentate pyridone ligands and three bidentate nitrate ions, giving a 9-coordinate environment. The mesogenic behavior and the type of liquid crystalline phases exhibited by the new complexes were analyzed by differential scanning calorimetry (DSC) and polarizing optical microscopy (POM), and powder X-ray diffraction (XRD) studies. Only the lanthanide complexes with longer spacer (10) display a monotropic SmA phase, typically on a short thermal range (less than 10 °C). The complexes with shorter flexible chains (9) show no liquid crystalline properties with melting temperatures lower than their analogs with longer spacers. The emission spectra recorded in solid state at room temperatures show typical emission bands for each lanthanide ion employed (Eu(III), Tb(III) and Sm(III)). Full article
(This article belongs to the Special Issue Inorganic Luminescent Materials: From Fundamental to Applications)
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12 pages, 3089 KiB  
Article
Unprecedented Coordination-Induced Bright Red Emission from Group 12 Metal-Bound Triarylazoimidazoles
by Artyom A. Astafiev, Olga V. Repina, Boris S. Tupertsev, Alexey A. Nazarov, Maria R. Gonchar, Anna V. Vologzhanina, Valentine G. Nenajdenko, Andreii S. Kritchenkov, Victor N. Khrustalev, Victor N. Nadtochenko and Alexander G. Tskhovrebov
Molecules 2021, 26(6), 1739; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules26061739 - 20 Mar 2021
Cited by 10 | Viewed by 2511
Abstract
Arylazoimidazoles are important dyes which were intensively studied in the past. In contrast, triarylazoimidazoles (derivatives which carry aryl substituents at the imidazole core) received almost no attention in the scientific literature. Here, we report a new family of simple and easily accessible triarylazoimidazole-group [...] Read more.
Arylazoimidazoles are important dyes which were intensively studied in the past. In contrast, triarylazoimidazoles (derivatives which carry aryl substituents at the imidazole core) received almost no attention in the scientific literature. Here, we report a new family of simple and easily accessible triarylazoimidazole-group 12 metal complexes, which feature highly efficient photo-luminescence emission (Φ up to  0.44). Novel compounds exhibit bright red emission in solution, which could be excited with a visible light. Full article
(This article belongs to the Special Issue Inorganic Luminescent Materials: From Fundamental to Applications)
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8 pages, 1108 KiB  
Article
Synthesis and Photophysical Properties of a Series of Dimeric Indium Quinolinates
by Sang Woo Kwak, Ju Hyun Hong, Sang Hoon Lee, Min Kim, Yongseog Chung, Kang Mun Lee, Youngjo Kim and Myung Hwan Park
Molecules 2021, 26(1), 34; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules26010034 - 23 Dec 2020
Cited by 3 | Viewed by 2108
Abstract
A novel class of quinolinol-based dimeric indium complexes (1–6) was synthesized and characterized using 1H and 13C(1H) NMR spectroscopy and elemental analysis. Compounds 1–6 exhibited typical low-energy absorption bands assignable to quinolinol-centered π–π* [...] Read more.
A novel class of quinolinol-based dimeric indium complexes (1–6) was synthesized and characterized using 1H and 13C(1H) NMR spectroscopy and elemental analysis. Compounds 1–6 exhibited typical low-energy absorption bands assignable to quinolinol-centered π–π* charge transfer (CT) transition. The emission spectra of 1–6 exhibited slight bathochromic shifts with increasing solvent polarity (p-xylene < tetrahydrofuran (THF) < dichloromethane (DCM)). The emission bands also showed a gradual redshift, with an increase in the electron-donating effect of substituents at the C5 position of the quinoline groups. The absolute emission quantum yields (ΦPL) of compounds 1 (11.2% in THF and 17.2% in film) and 4 (17.8% in THF and 36.2% in film) with methyl substituents at the C5 position of the quinoline moieties were higher than those of the indium complexes with other substituents. Full article
(This article belongs to the Special Issue Inorganic Luminescent Materials: From Fundamental to Applications)
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