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Ionoluminescence in the Helium Ion Microscope

Published online by Cambridge University Press:  14 December 2012

Stuart A. Boden ,
Thomas M.W. Franklin ,
Larry Scipioni ,
Darren M. Bagnall  and
Harvey N. Rutt
Stuart A. Boden*
Affiliation:
Electronics and Computer Science, University of Southampton, Highfield, Southampton SO17 1BJ, UK
Thomas M.W. Franklin
Affiliation:
Optoelectronics Research Centre, University of Southampton, Highfield, Southampton SO17 1BJ, UK
Larry Scipioni
Affiliation:
Carl Zeiss SMT, Inc., One Corporation Way, Peabody, MA 01960, USA
Darren M. Bagnall
Affiliation:
Electronics and Computer Science, University of Southampton, Highfield, Southampton SO17 1BJ, UK
Harvey N. Rutt
Affiliation:
Electronics and Computer Science, University of Southampton, Highfield, Southampton SO17 1BJ, UK
*
*Corresponding author. E-mail: sb1@ecs.soton.ac.uk
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Abstract

Ionoluminescence (IL) is the emission of light from a material due to excitation by an ion beam. In this work, a helium ion microscope (HIM) has been used in conjunction with a luminescence detection system to characterize IL from materials in an analogous way to how cathodoluminescence (CL) is characterized in a scanning electron microscope (SEM). A survey of the helium ion beam induced IL characteristics, including images and spectra, of a variety of materials known to exhibit CL in an SEM is presented. Direct band-gap semiconductors that luminesce strongly in the SEM are found not do so in the HIM, possibly due to defect-related nonradiative pathways created by the ion beam. Other materials do, however, exhibit IL, including a cerium-doped garnet sample, quantum dots, and rare-earth doped LaPO4 nanocrystals. These emissions are a result of transitions between f electron states or transitions across size dependent band gaps. In all these samples, IL is found to decay with exposure to the beam, fitting well to double exponential functions. In an exploration of the potential of this technique for biological tagging applications, imaging with the IL emitted by rare-earth doped LaPO4 nanocrystals, simultaneously with secondary electron imaging, is demonstrated at a range of magnifications.

Keywords

cathodoluminescenceionoluminescencehelium ion microscopyscanning electron microscopyyttrium aluminum garnet (YAG)rare earthquantum dots
Type
Special Section: Cathodoluminescence
Information
Microscopy and Microanalysis , Volume 18 , Issue 6 , December 2012 , pp. 1253 - 1262
Copyright
Copyright © Microscopy Society of America 2012

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