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Spectrochim Acta A Mol Biomol Spectrosc. 2012 May;90:18-21. doi: 10.1016/j.saa.2011.12.066. Epub 2011 Dec 30.

Ion beam induced amorphization and bond breaking in Zn2SiO4:Eu3+ nanocrystalline phosphor.

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  • 1Prof. CNR Rao Centre for Nano Research, Tumkur University, Tumkur, India.

Abstract

This paper reports on the ionoluminescence (IL) of Zn(2)SiO(4):Eu(3+) nanophosphors bombarded with 100 MeV Si(7+) ions with fluences in the range (3.91-21.48)×10(12) ions cm(-2). The prominent IL emission peaks recorded at 580, 590, 612, 650 and 705 nm are attributed to the luminescence centers activated by Eu(3+) ions. It is observed that IL intensity decreases and saturates with increase of Si(7+) ion fluence. Fourier transform infrared (FT-IR) studies confirm surface/bulk amorphization for a fluence of (3.91-21.48)×10(13) ions cm(-2). These results show degradation of SiO (2ν(3)) bonds present on the surface of the sample and/or due to lattice disorder produced by dense electronic excitation under heavy ion irradiation. These results are discussed in detail.

Copyright © 2011 Elsevier B.V. All rights reserved.

PMID:
22306445
[PubMed - indexed for MEDLINE]
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