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Photostimulated Luminescence Dynamics and Applications of AgI and Ag Nanoclusters in Medical Imaging

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Abstract

The photoluminescence and photostimulated luminescence of Ag and AgI nanoclusters formed in zeolite-Y are studied using fluorescence spectroscopy. The photoluminescence spectra of AgI nanoclusters show emission from both AgI and Ag nanoclusters, while in the photostimulated luminescence only the emission of Ag clusters is observed. While the photoluminescence displays both sub-nanosecond and microsecond lifetimes, the emission from photostimulated luminescence shows very short, picosecond lifetimes. A model which ascribes the photostimulated luminescence to recombination of electrons trapped in the zeolite with Ag particles at the surface or near-surface is proposed. The appearance of strong photostimulated luminescence with short decays in these systems demonstrates that nanoparticles have potential for digital storage and medical radiology applications.

© 2002 Optical Society of America

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