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Issue 26, 2015
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Optically stimulated persistent luminescence of europium-doped LaAlO3 nanocrystals

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Abstract

Optically stimulated persistent luminescence was investigated for europium-doped LaAlO3 nanocrystals. This system shows conventional luminescence of both the Eu3+ line emission and the weak broad-band emission of Eu2+ upon UV excitation. The persistent luminescence is predominantly associated with the Eu3+ emission, and can be amplified significantly through irradiation with IR at 975 nm. The conventional luminescence from Eu3+ is strongly enhanced when the material is excited simultaneously with both UV and IR radiation. The enhancement of persistent luminescence is accompanied by increased persistent photoconductivity. The charge transfer band of the LaAlO3:Eu3+ nanocrystals in the UV excitation spectra significantly weakens with increasing IR excitation power, also correlating well with the enhancement of persistent luminescence. Finally, a mechanism is presented for the optically stimulated and persistent luminescence in this Eu2+- and Eu3+-doped LaAlO3 material.

Graphical abstract: Optically stimulated persistent luminescence of europium-doped LaAlO3 nanocrystals

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Publication details

The article was received on 15 Jan 2015, accepted on 18 May 2015 and first published on 27 May 2015


Article type: Paper
DOI: 10.1039/C5CP00234F
Author version available: Download Author version (PDF)
Citation: Phys. Chem. Chem. Phys., 2015,17, 17246-17252
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    Optically stimulated persistent luminescence of europium-doped LaAlO3 nanocrystals

    P. Głuchowski, W. Stręk, M. Lastusaari and J. Hölsä, Phys. Chem. Chem. Phys., 2015, 17, 17246
    DOI: 10.1039/C5CP00234F

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