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Crystals
Special Issues
Lanthanide-Activated Inorganic Materials
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Lanthanide-Activated Inorganic Materials

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

Deadline for manuscript submissions: closed (20 March 2021) | Viewed by 4473

Special Issue Editors

Dr. Markus Suta

E-Mail Website
Guest Editor
Universiteit Utrecht, 3584 CC Utrecht, The Netherlands
Interests: lanthanide luminescence; luminescence thermometry; modelling; symmetry; spectroscopy
Dr. Nathalie Kunkel

E-Mail Website
Guest Editor
Institute of Inorganic Chemistry, Georg-August-Universität Göttingen, Göttingen, Germany
Interests: solid-state chemistry; lanthanide luminescence; spectroscopy; mixed-anionic compounds
Dr. Dechao Yu

E-Mail Website
Guest Editor
Department of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing, China
Interests: photon cutting; upconversion; energy transfer; Luminescence

Special Issue Information

Dear Colleagues,

Lanthanides in crystalline compounds have found wide applications as optical materials for different purposes. Examples include novel phosphors for LEDs, optical thermometers, or even quantum computing systems. The variety and rich 4fn energy level structure of the trivalent lanthanides makes the optical properties of these elements highly versatile. Besides the experimental progress, theoretical modelling of the lanthanide elements has also progressed in the last years, and even allows for comparing accurate simulations with experimental results. However, lanthanides also show an interesting redox chemistry and can be stabilized in the divalent or tetravalent oxidation state. The optical properties of lanthanides in these oxidation states can strongly differ from those in the trivalent lanthanides, because of the typically lower energetic 4fn-15d1 configuration, which has not been researched much and yet offers both fundamental and applicational new insights. Examples include the application of Eu2+ as a broad-band emitting ion for novel LED phosphors, Sm2+ as a pressure sensing ion, or Tm2+ for novel solar concentrators. This Topic Issue aims at providing a platform to explore these interesting topics and to help gain new scientific insight into the fascinating chemistry and physics of lanthanide elements.

Dr. Markus Suta
Dr. Nathalie Kunkel
Dr. Dechao Yu
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. 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

  • Phosphors
  • Luminescence thermometry
  • Upconversion
  • Downconversion
  • Scintillators
  • Photonics
  • Quantum computing
  • Lasers
  • Modelling

Published Papers (2 papers)

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Research

8 pages, 1816 KiB  
Article
Annealing Induced Saturation in Electron Concentration for V-Doped CdO
by Yajie Li, Guibin Chen, Kinman Yu, Wladyslaw Walukiewicz and Weiping Gong
Crystals 2021, 11(9), 1079; https://doi.org/10.3390/cryst11091079 - 6 Sep 2021
Viewed by 1488
Abstract
As-grown Ar-deposited Cd1−xVxO and Ar/O2-deposited Cd1−yVyO feature lower and higher electron concentrations than 4 × 1020 cm−3, respectively. After isothermal and isochronal annealing under N2 ambient, we find that [...] Read more.
As-grown Ar-deposited Cd1−xVxO and Ar/O2-deposited Cd1−yVyO feature lower and higher electron concentrations than 4 × 1020 cm−3, respectively. After isothermal and isochronal annealing under N2 ambient, we find that the two series exhibit a decrease or increase in electron concentrations until ~4 × 1020 cm−3 which is close to Fermi stabilization energy (EFS) level of CdO, with the assistance of native defects. An amphoteric defects model is used to explain the changing trends in electron concentrations. The tendencies in mobility further confirm our results. This work may provide some strategies to predict the electrical properties in CdO. Full article
(This article belongs to the Special Issue Lanthanide-Activated Inorganic Materials)
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12 pages, 2576 KiB  
Article
2.0 μm Ultra Broadband Emission from Tm3+/Ho3+ Co-Doped Gallium Tellurite Glasses for Broadband Light Sources and Tunable Fiber Lasers
by Jian Yuan, Weichao Wang, Yichen Ye, Tingting Deng, Yizhao Huang, Shitao Gu, Yuanbin Chen and Peng Xiao
Crystals 2021, 11(2), 190; https://doi.org/10.3390/cryst11020190 - 15 Feb 2021
Cited by 15 | Viewed by 2418
Abstract
A flat 2.0 μm ultra broadband emission with a full width at half maximum (FWHM) of 329 nm is achieved in 1 mol.% Tm2O3 and 0.05 mol.% Ho2O3 co-doped gallium tellurite glasses upon the excitation of an [...] Read more.
A flat 2.0 μm ultra broadband emission with a full width at half maximum (FWHM) of 329 nm is achieved in 1 mol.% Tm2O3 and 0.05 mol.% Ho2O3 co-doped gallium tellurite glasses upon the excitation of an 808 nm laser diode. The influence of Tm3+ and Ho3+ contents on 2.0 μm spectroscopic properties of gallium tellurite glasses is minutely investigated by absorption spectra, emission spectra, and lifetime measurement. In addition, emission cross section and gain coefficient of Ho3+ ions at 2.0 μm are calculated, and the maximum values reach 8.2 × 10−21 cm2 and 1.54 cm−1, respectively. Moreover, forward and backward energy transfer probability between Tm3+ and Ho3+ ions are qualitatively evaluated by the extended spectral overlap method. Large ratio of the forward energy transfer from Tm3+ to Ho3+ to the backward one (19.7) and high forward energy transfer coefficient (6.22 × 1039 cm6/s) are responsible for effective 2.0 μm emission from Ho3+ ions. These results manifest that Tm3+/Ho3+ co-doped gallium tellurite glass is suitable for potential applications of broadband light sources and tunable fiber lasers operating in eye-safe 2.0 µm spectral region. Full article
(This article belongs to the Special Issue Lanthanide-Activated Inorganic Materials)
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