Synthesis and luminescent properties of MgAl2O4:Eu nanopowders

► Using of the laser evaporation method allows producing phosphorous nanopowder Eu doped spinel MgAl2O4. ► Annealing of the nanopowder in air under a layer of coal at temperatures over 1000°C leads to the dissolution of the Eu. ► Luminescent properties of the annealed NPs can be effectively analyzed...

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Bibliographic Details
Published in:Journal of alloys and compounds 2014-02, Vol.586, p.S472-S475
Main Authors: Beketov, I.V., Medvedev, A.I., Samatov, O.M., Spirina, A.V., Shabanova, K.I.
Format: Article
Language:English
Subjects:
Aluminum oxide
Annealing
Cathode luminescence
Coal
Emission
Eu3+ doped MgAl2O4
Grain size
Laser evaporation
Luminescence
Magnesium oxide
Nanopowders
Nanostructure
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Summary:► Using of the laser evaporation method allows producing phosphorous nanopowder Eu doped spinel MgAl2O4. ► Annealing of the nanopowder in air under a layer of coal at temperatures over 1000°C leads to the dissolution of the Eu. ► Luminescent properties of the annealed NPs can be effectively analyzed by the cathode luminescence method. ► The luminescent properties of the produced nanopowders strongly depend on the annealing temperature and the Eu content. Nanopowders (NPs) of Eu doped MgAl2O4 were produced by laser evaporation of mixtures of micron sized powders of Al2O3, MgO and Eu2O3 with content of Eu 1, 2 and 4mol%. The produced NPs were weak agglomerated and consisted of spherical particles with a mean diameter of 12–17nm. The main phase of the NPs is defective spinel with a grain size 14nm and content 91wt.%. The produced powder contains additional phases of MgO and Eu2O3 as well. In order to form a structure of MgAl2O4:Eu3+ the NPs were annealed in air under a layer of coal at different temperatures from 800°С to 1300°С. Luminescent properties of the annealed NPs were analyzed by the pulse cathode luminescence (PCL) method. The NP with the lowest Eu content had the highest emission intensity. The emission spectra of the NPs strongly depend on the annealing temperature. The maximum of emission intensity of the band 520nm was observed at the annealing temperature of 1200°C.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2013.02.070