Two photon induced luminescence of BSA protected gold clusters

[Display omitted] ► BSA Au25 nanoclusters of about 8nm. ► NIR (650nm) fluorescence emission. ► Excitation power and emission intensity quadratic dependence. ► Two photon excitation capability. ► Similar emission spectra for one and two photon excitation. In this short Letter, we have synthesized the...

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Bibliographic Details
Published in:Chemical physics letters 2013-03, Vol.561-562, p.74-76
Main Authors: Raut, Sangram L., Shumilov, Dmytro, Chib, Rahul, Rich, Ryan, Gryczynski, Zygmunt, Gryczynski, Ignacy
Format: Article
Language:English
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Summary:[Display omitted] ► BSA Au25 nanoclusters of about 8nm. ► NIR (650nm) fluorescence emission. ► Excitation power and emission intensity quadratic dependence. ► Two photon excitation capability. ► Similar emission spectra for one and two photon excitation. In this short Letter, we have synthesized the BSA protected Au25 nanoclusters and studied their two photon luminescence behavior. We demonstrate that BSA Au25 nanoclusters can be used as a probe with two photon excitation capability. Our results show a quadratic relation between excitation power and emission intensity whereas with one photon excitation shows a linear dependence. The emission spectrum of BSA Au25 nanoclusters with one photon and two photon excitation shows no appreciable change. Due to its long wavelength emission (650nm) and two photon excitation, BSA Au25 can be potentially used as a probe for deep tissue imaging.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2013.01.028