Interaction of dyes with Ag2S nanoclusters adsorbed on AgBr microcrystals

The photoexcitation relaxation is considered in a system consisting of a molecular and J -aggregated dye adsorbed on the surface of silver sulfide nanosized clusters (nanoclusters) placed on AgBr microc-rystals. It is found that the photoexcitation in the region of the dye absorption relaxes not onl...

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Bibliographic Details
Published in:Optics and spectroscopy 2010-06, Vol.108 (6), p.958-963
Main Authors: Tyurin, A. V., Churashov, V. P., Zhukov, S. A., Levitskaya, T. F., Berkov, Yu. N.
Format: Article
Language:English
Subjects:
Condensed-Matter Spectroscopy
Lasers
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
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Summary:The photoexcitation relaxation is considered in a system consisting of a molecular and J -aggregated dye adsorbed on the surface of silver sulfide nanosized clusters (nanoclusters) placed on AgBr microc-rystals. It is found that the photoexcitation in the region of the dye absorption relaxes not only via the fluorescence, but also via the phosphorescence of nanoclusters. It is shown that, depending on the dye, the phosphorescence of nanoclusters is most efficiently excited in the absorption region of either molecular or J -aggregated states of dyes. It is assumed that this difference is caused by different nature of the adsorption of dyes on the nanocluster surface and by different interactions between the photoexcited states of dye molecules and J aggregates. These results can find wide applications in various fields of nanophotonics and allow one to both control the photoexcitation relaxation processes in nanocluster-dye systems and to observe new manifestations of these processes.
ISSN:0030-400X
1562-6911
DOI:10.1134/S0030400X10060202