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Advances in Phosphors for Light-Emitting Diode

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Composites".

Deadline for manuscript submissions: closed (20 May 2023) | Viewed by 3508

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Guest Editor
Institute of Applied Physics “N. Carrara”, IFAC, National Research Council, CNR, 50019 Sesto Florence, Italy
Interests: solid-state laser; laser crystals; polycrystalline ceramics; nanomaterials; nonlinear optics; LED technology
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Special Issue Information

Dear Colleagues,

The quality of our life is strictly related to the quality of the environment where we live. A drastic decrease in pollution by using wise management of energetic sources is mandatory. To achieve this goal, strong economic investments in the development of low-energy consumption devices are necessary. In lighting system fields, this has strongly stimulated the use of LEDs (i.e., Light-Emitting Diodes).

The main goal of this Special Issue is to attract scientific contributions reporting experimental and theoretical studies on converting phosphors for manufacturing LEDs. In particular, I would like to invite scientists to submit manuscripts focused on new materials that exploit less expensive chemical elements, new synthesis methods, studies of photoluminescence mechanisms, spectroscopic measurements, and thermal stability measurements. Reviews are welcomed.

Dr. Angela Pirri
Guest Editor

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Keywords

  • Synthesis
  • Activators
  • Oxide, fluoride, oxifluoride matrices
  • Nanomaterials
  • Structural and morphological characterization
  • Photoluminescence mechanisms
  • Spectroscopic properties
  • Thermal stability
  • Modeling e-simulation
  • Applications

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Published Papers (1 paper)

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Research

13 pages, 2100 KiB  
Article
Time- and Temperature-Dependent Luminescence of Manganese Ions in Ceramic Magnesium Aluminum Spinels
by Nicholas Khaidukov, Angela Pirri, Maria Brekhovskikh, Guido Toci, Matteo Vannini, Barbara Patrizi and Vladimir Makhov
Materials 2021, 14(2), 420; https://doi.org/10.3390/ma14020420 - 16 Jan 2021
Cited by 18 | Viewed by 2558
Abstract
Samples of magnesium aluminum spinel ceramics doped with manganese ions were prepared by a high-temperature solid-state reaction method; their potential as red-emitting phosphors was analyzed using a time-resolved luminescence spectroscopy technique, from room temperature to 10 K. It was found that in the [...] Read more.
Samples of magnesium aluminum spinel ceramics doped with manganese ions were prepared by a high-temperature solid-state reaction method; their potential as red-emitting phosphors was analyzed using a time-resolved luminescence spectroscopy technique, from room temperature to 10 K. It was found that in the red spectral range, the luminescence spectra of manganese ions in the MgAl2O4 spinel showed a narrow band peaking at 651 nm due to the emission of Mn4+ and a broader emission band in the region of 675 ÷ 720 nm; the ratio of intensities for these bands depends on the synthesis conditions. By applying a special multi-step annealing procedure, the MgAl2O4:Mn4+ phosphor containing only tetravalent manganese ions, Mn4+, was synthesized. Broad-band far-red emission observed from MgAl2O4:Mn and Mg1.25Al1.75O3.75F0.25:Mn phosphors, prepared by a conventional method of a solid-state reaction, was interpreted as coming from Mn3+ ions. Full article
(This article belongs to the Special Issue Advances in Phosphors for Light-Emitting Diode)
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