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Proceedings Paper

Novel online security system based on rare-earth-doped glass microbeads
Author(s): Simon Officer; G. Radhakrishna Prabhu; Pat Pollard; Catherine Hunter; Gary A. Ross
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Paper Abstract

A novel fluorescent security label has been produced that could replace numerous conventional fluorescent dyes in document security. This label utilizes rare earth ions doped in a borosilicate glass matrix to produce sharp spectral fluorescence peaks with characteristic long lifetimes due to the rare earth ions. These are subsequently detected by an online detection system based on fluorescence and the long lifetimes to avoid any interference from other fluorophores present in the background. Security is further enhanced by the interaction of the rare earth ions with each other and the effect of the host on the emission spectra and therefore the number of permutations that could be produced. This creates a very secure label with various applications for the security market.

Paper Details

Date Published: 3 June 2004
PDF: 9 pages
Proc. SPIE 5310, Optical Security and Counterfeit Deterrence Techniques V, (3 June 2004); doi: 10.1117/12.528191
Show Author Affiliations
Simon Officer, The Robert Gordon Univ. (United Kingdom)
G. Radhakrishna Prabhu, The Robert Gordon Univ. (United Kingdom)
Pat Pollard, The Robert Gordon Univ. (United Kingdom)
Catherine Hunter, The Robert Gordon Univ. (United Kingdom)
Gary A. Ross, NCR FSG Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 5310:
Optical Security and Counterfeit Deterrence Techniques V
Rudolf L. van Renesse, Editor(s)

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