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 inMaterials chemistry and physics Vol. 250; p. 123149
Main Authors Lemański, K., Sztolberg, D., Brzostowski, B., Drzewiecki, A., Stefańska, D., Dereń, P.J.
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 01.08.2020
Elsevier BV
Subjects
Electron paramagnetic resonance
Emission spectra
Energy transfer
Excitation spectra
LaAlO3
Luminescence
Magnetic properties
Manganese ions
Perovskites
Polycrystals
Temperature dependence
LaAlO3
Perovskites
Energy transfer
Manganese ions
Luminescence
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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.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2020.123149