Multifunctionality of GdPO sub(4):Yb super(3+),Tb super(3+) nanocrystals - luminescence and magnetic behaviour

Multifunctional, luminescent and magnetic systems were synthesised by a co-precipitation method and broadly investigated. In our studies down- and visible up-conversion of Yb super(3+) and Tb super(3+) doped GdPO sub(4) nanocrystals were observed. The synthesised nanomaterials were analysed by X-ray...

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Bibliographic Details
Published in:Journal of materials chemistry 2012-10, Vol.22 (43), p.22989-22997
Main Authors: Grzyb, Tomasz, Gruszeczka, Aleksandra, Wiglusz, Rafal J, Sniadecki, Zbigniew, Idzikowski, Bogdan, Lis, Stefan
Format: Article
Language:English
Subjects:
Accumulation
Energy transfer
Excitation
Luminescence
Nanocrystals
Nanomaterials
Spectroscopy
Ultraviolet
Online Access:Get full text
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Summary:Multifunctional, luminescent and magnetic systems were synthesised by a co-precipitation method and broadly investigated. In our studies down- and visible up-conversion of Yb super(3+) and Tb super(3+) doped GdPO sub(4) nanocrystals were observed. The synthesised nanomaterials were analysed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Spectroscopic properties were determined from excitation and emission spectra together with a subsequent analysis. The build-up characteristics of luminescence decays showed the energy transfer processes that occurred. Magnetic measurements were performed by means of vibrating sample magnetometry (VSM). These nanomaterials showed intense green emission under ultraviolet (UV), 272 nm, and near infrared (NIR), 980 nm, laser excitation. The mechanism lying behind the observed spectroscopic properties was proposed. Energy transfer between Gd super(3+) and Tb super(3+) ions, as well as cooperative energy transfer from Yb super(3+) to Tb super(3+), was found to give a dual-mode luminescence. Also, quenching processes by cross-relaxation and phonon-assisted energy transfer were observed. The presence of different lanthanide ions and the influence of the finite-size effect underlie the complex behaviour observed.
ISSN:0959-9428
1364-5501
DOI:10.1039/c2jm34863b