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Time- and Temperature-Dependent Luminescence of Manganese Ions in Ceramic Magnesium Aluminum Spinels
| Content Provider | MDPI |
|---|---|
| Author | Khaidukov, Nicholas Pirri, Angela Brekhovskikh, Maria Toci, Guido Vannini, Matteo Patrizi, Barbara Makhov, Vladimir |
| Copyright Year | 2021 |
| Description | 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. |
| Starting Page | 420 |
| e-ISSN | 19961944 |
| DOI | 10.3390/ma14020420 |
| Journal | Materials |
| Issue Number | 2 |
| Volume Number | 14 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-01-16 |
| Access Restriction | Open |
| Subject Keyword | Materials Inorganic Chemistry Spinel Ceramics Photoluminescence Time-resolved Spectroscopy Red-emitting Mn4+ Phosphors Phosphor-converted Led |
| Content Type | Text |
| Resource Type | Article |
