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Proceedings Paper

Ultrafast transient bleaching of CdS nanoparticles in various media
Author(s): Toshihiko Nagamura; Hiroshi Inoue; Hiroshi Sakaguchi; Franz Grieser; Robert Urquhart; David J. Elliot; D. Neil Furlong
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Paper Abstract

Ultrafast dynamics of transient photobleaching and recovery of cadmium sulphide (CdS) nanoparticles of different size ranging from less than 3.5 nm to greater than 5.0 nm, dispersed in Nafion films, in self-assembled films, and in aqueous solutions were studied upon excitation at 400 nm with a femtosecond laser. All samples gave transient bleaching in less than 1 ps and a multi-exponential recovery in the wavelength region above about 410 nm. The peak wavelength of the transient bleaching and its time dependence together with the recovery behavior were affected by the particle size, surface treatment and the supporting medium. The peak of the transient bleaching spectrum of larger CdS nanoparticles showed a red-shift during the recovery process, while for the smaller particles no such change was observed. CdS nanoparticles in self-assembled films showed an extremely long-lived bleaching recovery process. Fluorescence-activated CdS nanoparticles in aqueous solutions, which showed very strong and sharp fluorescence near the exciton absorption, showed very fast recovery. These results were explained by the decay of excitons and the recombination of surface trapped electron-hole pairs with different energies depending on the particle size.

Paper Details

Date Published: 6 July 1998
PDF: 8 pages
Proc. SPIE 3469, Organic-Inorganic Hybrid Materials for Photonics, (6 July 1998); doi: 10.1117/12.312918
Show Author Affiliations
Toshihiko Nagamura, Shizuoka Univ. (Japan)
Hiroshi Inoue, Shizuoka Univ. (Japan)
Hiroshi Sakaguchi, Shizuoka Univ. (Japan)
Franz Grieser, Univ. of Melbourne (Australia)
Robert Urquhart, CSIRO (Australia)
David J. Elliot, CSIRO (Australia)
D. Neil Furlong, CSIRO (Australia)


Published in SPIE Proceedings Vol. 3469:
Organic-Inorganic Hybrid Materials for Photonics
Liliane G. Hubert-Pfalzgraf; S. Iraj Najafi, Editor(s)

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