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Cathodoluminescence Microanalysis of Irradiated Microcrystalline and Nanocrystalline Samarium Doped BaFCl

Published online by Cambridge University Press:  20 November 2012

Marion A. Stevens-Kalceff ,
Zhiqiang Liu  and
Hans Riesen
Marion A. Stevens-Kalceff*
Affiliation:
School of Physics, University of New South Wales, Sydney NSW 2052, Australia Electron Microscope Unit, Mark Wainwright Analytical Centre, University of New South Wales, Sydney NSW 2052, Australia
Zhiqiang Liu
Affiliation:
School of Physical, Environmental and Mathematical Sciences, University of New South Wales, ADFA, Canberra ACT 2600, Australia
Hans Riesen
Affiliation:
School of Physical, Environmental and Mathematical Sciences, University of New South Wales, ADFA, Canberra ACT 2600, Australia
*
*Corresponding author. E-mail: [email protected]
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Abstract

BaFCl:Sm3+ is an efficient photoluminescent storage phosphor for ionizing radiation. Cathodoluminescence (CL) microanalysis enables the Sm2+ and Sm3+ oxidation states of samarium doped BaFCl to be easily identified, provides information about electron-beam and X-ray induced modification of BaFCl:Sm, and enables the synthesis dependent spatial distribution of samarium dopants of <100 ppm concentration to be determined with sub-100 nm resolution at 295 K. CL spectroscopy of BaFCl:Sm particles reveals broad CL emissions at ∼360 and ∼500 nm associated with Vk(Cl−) and oxygen-vacancy defects in the BaFCl host lattice and fine structure CL emissions associated with major 4GJ → 6HJ (Sm3+) and 5DJ → 7FJ (Sm2+) transitions. CL microanalysis shows samarium dopants are uniformly distributed in conventional sintered microcrystalline BaFCl:Sm. In contrast, CL investigations reveal that for BaFCl:Sm nanoparticles, which have been prepared using a co-precipitation method, with greatly improved Sm3+ → Sm2+ conversion efficiency, the samarium dopants are concentrated near the particle surface resulting in a BaFCl:Sm3+ shell surrounding the BaFCl core, which is stable to energetic irradiation.

Keywords

cathodoluminescencemicroanalysisnanoparticlesphosphorssamariumcore shell
Type
Special Section: Cathodoluminescence
Information
Microscopy and Microanalysis , Volume 18 , Issue 6 , December 2012 , pp. 1229 - 1238
Copyright
Copyright © Microscopy Society of America 2012

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