Special Issue "Phosphors Based on Rare Earth and Transition Metal Ions Doped Crystals"

A special issue of Crystals (ISSN 2073-4352).

Deadline for manuscript submissions: 1 February 2018

Special Issue Editor

Guest Editor
Prof. Dr. hab. Przemysław Jacek Dereń

Institute of Low Temperature and Structure Research, PAS, Okolna 2, 50-422 Wrocław, Poland
Website1 | Website2 | E-Mail
Interests: electronic spectroscopy of rare earth and transition metal ions; upconversion; downconversion; phosphors; WLED; health effects of artificial light

Special Issue Information

Dear Colleagues,

Dielectric and wide band semiconductors crystals doped with Rare Earth and Transition Metal Ions, due to unique spectroscopic properties, are used as phosphors. The broad use of phosphors started in the 1940s. They were introduced in the form of polycrystals in fluorescent tubes. Indeed, a new era of lighting has begun; thus far, all light sources invented by man mainly generate heat. Construction of the blue LED was another important progress that was achieved. Modern light sources may reduce the cost of lighting to the levels not previously imaginable and new features, thus far not common, are now accessible. By applying phosphors, we are, for the first time, in the position of creating light, which may mimic sunlight. Thus, for the first time, it is possible to drive human circadian rhythms, hormone production, and, consequently, health.

Moreover, based only on phosphors, light sources may be adjusted to specific purposes; for instance, in horticulture, since plants need only a specific part of solar radiation. Phosphors are also important in many other fields, such as medicine, or in the protection of valuables or for anti-counterfeiting measures. The list of phosphors and their application is large; there are long lasting or persistent phosphors, storage phosphors, or phosphors that may improve quantum efficiency of solar cells, both polycrystalline and monocrystalline phosphors are used for X-ray and gamma detection, and, last but not least, exists phosphors high Quantum Efficiency higher than 100%.

We invite investigators to submit papers, which discuss the development of phosphors. The potential topics include, but are not limited to:

  • Modeling of phosphors.
  • Property characterization and their relationships to external conditions, such as pressure , temperature, etc.
  • Advances in development of phosphors.
  • Reliability and stability of the phosphors including aging, temperature and UV and VUV excitation, etc.
  • Phosphors for improvement of solar cells efficiency.
  • Phosphors for detection of high energy radiation
  • Applications of phosphors and prototype demonstration.

Prof. Dr. hab. Przemysław Jacek Dereń
Guest Editor

Manuscript Submission Information

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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 1000 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
  • phosphors growth
  • storage phosphors,
  • persistent phosphors
  • upconverting phosphors
  • down shifting phosphors
  • sensor phosphors
  • phosphors used in medicine
  • phosphors for horticulture
  • phosphor aging
  • Antena effect phosphors

Published Papers (1 paper)

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Research

Open AccessArticle Dopant Concentration Induced Optical Changes in Ca,Eu-α-Sialon
Crystals 2017, 7(11), 342; doi:10.3390/cryst7110342
Received: 17 August 2017 / Revised: 1 November 2017 / Accepted: 3 November 2017 / Published: 8 November 2017
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Abstract
The phosphor powders of Ca(m/2)−xEuxSi12−(m+n)Alm+nOnN16−n (m = 1.6, n = 0.8, x in the range of 0–0.08) were synthesized by means of a solid state reaction in flowing nitrogen in a carbon
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The phosphor powders of Ca(m/2)−xEuxSi12−(m+n)Alm+nOnN16−n (m = 1.6, n = 0.8, x in the range of 0–0.08) were synthesized by means of a solid state reaction in flowing nitrogen in a carbon resistant furnace and the influence of Eu concentration on the crystal structure and photoluminescent properties was thoroughly studied. The optical properties of selected α-sialon:Eu2+ samples at temperatures in the range of 10 to 500 K and pressures up to 240 kbar are presented. The crystal lattice parameters were affected by doping with europium and some increase of the unit cell volume was observed up to 6 mol % of Eu. The higher concentration of europium led to subtle changes in the overall structure of the produced sialon phosphors. It was shown that the chemical composition of Ca, Eu-α-sialon phosphor was slightly different from the designed one and the phosphor powders were contaminated by AlN. The phosphor particle surface showed significant europium and oxygen enrichment with Eu3+ but below the thin surface layer Eu2+ was dominant and higher nitrogen content was observed. After examination of absorption, excitation, and emission spectra it was found that the emission peak position shifted toward longer wavelengths with rising Eu2+ concentration from 565 nm (0.1 mol % Eu2+) to 585 nm (10 mol % Eu2+). The quantum yield of the phosphors reached the maximum at a rather low concentration of 4 mol % of Eu. Excitation spectra depend on the monitored wavelength which is typical for multisite Eu2+. The existence of many Eu2+ sites in the sample was supported by the dependence of the decay time on the monitored wavelength. Full article
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