Special Issue "Optical Materials for White Light Emitting Diodes (WLEDs)"

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: 31 December 2019.

Special Issue Editors

Prof. Arturas Katelnikovas
E-Mail Website
Guest Editor
Vilnius University, Faculty of Chemistry and Geosciences, Institute of Chemistry, Naugarduko 24, LT-03225 Vilnius, Lithuania
Interests: LED phosphors, carbon quantum dots, photochemistry, nanoparticle synthesis, luminescence spectroscopy
Prof. Simas Sakirzanovas
E-Mail Website
Guest Editor
Vilnius University, Faculty of Chemistry and Geosciences, Institute of Chemistry, Naugarduko 24, LT-03225 Vilnius, Lithuania
Interests: upconverting nanoparticles, luminescence spectroscopy, functional materials, high pressure synthesis, materials science

Special Issue Information

Dear Colleagues,

The efficiency of blue and near-UV LED chips are ever increasing and it is only a matter of time until solid state light sources replace the conventional incandescent, halogen and even fluorescent light bulbs. Thus the demand for high-efficiency phosphors that can be excited in the blue or near-UV spectral region is very high. The topics of this Special Issue include, but are not limited to, the following:

  • Novel synthesis techniques
  • Efficiency improvement
  • Methods of quantum efficiency measurements
  • Particle shape optimization
  • Thermal quenching improvement
  • Phosphor ceramics
  • Garnet phosphors
  • Silicate phosphors
  • Oxide-based phosphors
  • Sulfides
  • Oxynitrides and nitrides
  • Phosphors for near-UV LEDs
  • Single-phase, white-light-emitting phosphors
  • Blue/cyan-emitting phosphors
  • Green/yellow-emitting phosphors
  • Orange/red-emitting phosphors

We would like to take this opportunity to invite you to submit your manuscripts to the Special Issue “Optical Materials for White-Light-Emitting Diodes (WLEDs)” of Materials in the form of full research article, short communication or a review.

Prof. Arturas Katelnikovas
Prof. Simas Sakirzanovas
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 papers will be 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 1800 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

  • LED phosphors
  • synthesis
  • quantum efficiency
  • thermal quenching
  • rare-earth ions
  • transition metal ions
  • luminescence

Published Papers (2 papers)

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Research

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Open AccessArticle
Optical Properties of Red-Emitting Rb2Bi(PO4)(MoO4):Eu3+ Powders and Ceramics with High Quantum Efficiency for White LEDs
Materials 2019, 12(19), 3275; https://doi.org/10.3390/ma12193275 - 08 Oct 2019
Abstract
There are several key requirements that a very good LED phosphor should meet, i.e., strong absorption, high quantum efficiency, high colour purity, and high luminescence quenching temperature. The reported Rb2Bi(PO4)(MoO4):Eu3+ phosphors have all these properties. The [...] Read more.
There are several key requirements that a very good LED phosphor should meet, i.e., strong absorption, high quantum efficiency, high colour purity, and high luminescence quenching temperature. The reported Rb2Bi(PO4)(MoO4):Eu3+ phosphors have all these properties. The Rb2Bi(PO4)(MoO4):Eu3+ phosphors emit bright red light if excited with near-UV radiation. The calculated colour coordinates show good stability in the 77–500 K temperature range. Moreover, sample doped with 50% Eu3+ possesses quantum efficiency close to unity. Besides the powder samples, ceramic disks of Rb2Eu(PO4)(MoO4) specimen were also prepared, and the red light sources from these disks in combination with near-UV emitting LED were fabricated. The obtained results indicated that ceramic disks efficiently absorb the emission of 375 and 400 nm LED and could be applied as a red component in phosphor-converted white LEDs. Full article
(This article belongs to the Special Issue Optical Materials for White Light Emitting Diodes (WLEDs))
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Review

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Open AccessReview
Exploration of the Structural and Photophysical Characteristics of Mono- and Binuclear Ir(III) Cyclometalated Complexes for Optoelectronic Applications
Materials 2019, 12(17), 2734; https://doi.org/10.3390/ma12172734 - 26 Aug 2019
Abstract
Intrinsic characteristics possessed and exhibited by Ir(III) cyclometalated complexes need to be further examined, understood, and explored for greater value enhancement and potentiation. This work focuses primarily on the comparative studies of the ligand structures, types, and their substituent influence on the photophysical [...] Read more.
Intrinsic characteristics possessed and exhibited by Ir(III) cyclometalated complexes need to be further examined, understood, and explored for greater value enhancement and potentiation. This work focuses primarily on the comparative studies of the ligand structures, types, and their substituent influence on the photophysical and optoelectronic properties of typical cyclometalated mono- and binuclear iridium(III) complexes in solution or solid states. Full article
(This article belongs to the Special Issue Optical Materials for White Light Emitting Diodes (WLEDs))
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