Fluorescence quenching and photobleaching in Au/Rh6G nanoassemblies: impact of competition between radiative and non-radiative decay
2011 (English)In: JOURNAL OF THE EUROPEAN OPTICAL SOCIETY-RAPID PUBLICATIONS, ISSN 1990-2573, Vol. 6, 11019- p.Article in journal (Refereed) Published
We report the study of fluorescence quenching from nanoassemblies formed by Rhodamine 6G and gold nanoparticles (Au NPs) of 2.6 nm radius. The presence of Au NPs induces long-term degradation of the photostability (photobleaching) of Rhodamine 6G used as a gain medium in a Fabry-Perot laser cavity. We found that the degradation gets profound when the Au NPs concentration is significantly increased. Calculation of the radiative rate and direct time-resolved measurement of the fluorescence decay indicates that both the decrease of radiative decay rate and increase of non-radiative decay rate are responsible for the fluorescence quenching and photostability degradation. An energy transfer from the dye molecules to gold nanoparticles is dominating within small distance between them and suppresses the quantum efficiency of Rhodamine 6G drastically. In a long time scale, the photobleaching rate was slowing down, and the laser output intensity reached a stabilized level which depends on the gold nanoparticles concentration.
Place, publisher, year, edition, pages
2011. Vol. 6, 11019- p.
gold nanoparticles, Rhodamine 6G, fluorescence quenching, photostability
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-34659DOI: 10.2971/jeos.2011.11019ISI: 000291056100002ScopusID: 2-s2.0-84863248410OAI: oai:DiVA.org:kth-34659DiVA: diva2:426496
QC 201106232011-06-232011-06-132012-06-05Bibliographically approved