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Implications of the solubility of trivalent lanthanides in AAl2O4 (A=Ca, Sr, and Ba) for their role in phosphors

Published online by Cambridge University Press:  01 March 2012

Paul J. Saines  and
Brendan J. Kennedy
Paul J. Saines
Affiliation:
School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
Brendan J. Kennedy
Affiliation:
School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
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Abstract

The technique of standard addition in combination with powder X-ray diffraction was used to identify and quantify the amount of Ln3+ segregating into secondary phases from Ln3+doped alkaline earth aluminates. Results indicate that Ln3+ ions are more soluble in CaAl2O4 than SrAl2O4 and BaAl2O4, with this being rationalized by the structural details of the A sites. These results indicate that the enhancement of the luminescence afterglow obtained by doping AAl2O4:Eu2+ samples with Ln3+ ions is a result of much lower doping levels than previously thought.

Keywords

powder X-ray diffractionquantitative analysislanthanidesalkaline-earth aluminatesstandard addition

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Type
Technical Articles
Information
Powder Diffraction , Volume 21 , Issue 4 , December 2006 , pp. 285 - 288
Copyright
Copyright © Cambridge University Press 2006

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