Spectroscopic and paramagnetic studies of LaAlO3 polycrystals doped with manganese ions
In this contribution, the spectroscopic and magnetic properties of manganese ions in a rhombohedral LaAlO3 perovskite are reported. Micro powders were prepared by the Pechini method. We present absorption, excitation and emission spectra of LaAlO3 polycrystals doped with Mn4+ (3 d3) ions, as well as...
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Published in | Materials chemistry and physics Vol. 250; p. 123149 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Lausanne
Elsevier B.V
01.08.2020
Elsevier BV |
Subjects | |
Online Access | Get full text |
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Summary: | In this contribution, the spectroscopic and magnetic properties of manganese ions in a rhombohedral LaAlO3 perovskite are reported. Micro powders were prepared by the Pechini method. We present absorption, excitation and emission spectra of LaAlO3 polycrystals doped with Mn4+ (3 d3) ions, as well as the luminescent decay time and temperature-dependent emission intensity measurements. The quantum yield of the LaAlO3:0.1% Mn4+ sample reaches 47%. We also show the electron paramagnetic resonance spectrum, which reveals the presence of Mn2+ ions.
•Spectroscopic and paramagnetic properties of LaAlO3:Mn polycrystals were investigated.•The excitation spectrum possesses two broad bands with the maximum at 357 and 495 nm.•Calculated Racah parameters show that Mn4+ ions are located in a strong crystal field.•Observed red luminescence with the maximum at about 730 nm may be used in agriculture. |
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ISSN: | 0254-0584 1879-3312 |
DOI: | 10.1016/j.matchemphys.2020.123149 |