New Transient Absorption Observed in the Spectrum of Colloidal CdSe Nanoparticles Pumped with High-Power Femtosecond Pulses

New Transient Absorption Observed in the Spectrum of Colloidal CdSe Nanoparticles Pumped with High-Power Femtosecond Pulses

The power dependence of the transient absorption spectrum of CdSe nanoparticle colloids with size distribution of 4.0 ± 0.4 nm diameter is studied with femtosecond pump−probe techniques. At the lowest pump laser power, the absorption bleaching (negative spectrum) characteristic of the exciton spectr...

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Veröffentlicht in:Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical Surfaces, Interfaces, amp Biophysical, 1999-12, Vol.103 (49), p.10775-10780
Hauptverfasser: Burda, C, Link, S, Green, T. C, El-Sayed, M. A
Format: Artikel
Sprache:eng
Schlagworte:
ABSORPTION SPECTROSCOPY
CADMIUM SELENIDE SOLAR CELLS
CADMIUM SELENIDES
COLLOIDS
MATERIALS SCIENCE
OPTICAL PROPERTIES
SEMICONDUCTOR MATERIALS
SOLAR ENERGY
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Zusammenfassung:The power dependence of the transient absorption spectrum of CdSe nanoparticle colloids with size distribution of 4.0 ± 0.4 nm diameter is studied with femtosecond pump−probe techniques. At the lowest pump laser power, the absorption bleaching (negative spectrum) characteristic of the exciton spectrum is observed with maxima at 560 and 480 nm. As the pump laser power increases, two new transient absorptions at 510 and 590 nm with unresolved fast rise (
ISSN:1520-6106
1089-5647
1520-5207
DOI:10.1021/jp991503y