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Long-Lifetime Nonlinear Absorption of PbS Quantum Dots

Published online by Cambridge University Press:  11 February 2011

Feiran Huang ,
Aleksey Filin ,
Pratima G.N. Rao ,
Robert H. Doremus  and
Peter D. Persans
Feiran Huang
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, U.S.A
Aleksey Filin
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, U.S.A
Pratima G.N. Rao
Affiliation:
Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Tory, New York 12180, U.S.A
Robert H. Doremus
Affiliation:
Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Tory, New York 12180, U.S.A
Peter D. Persans
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, U.S.A
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Abstract

We have fabricated PbS particles in glass of average size from 1.2 nm to 3 nm. This allows us to tune the energy of the lowest electron-hole pair transition from 1.7 eV to 0.8 eV respectively. Optical absorption spectra show a pronounced quantum peak, implying a narrow size distribution. We have performed pump-probe spectroscopy where the probe is cw and the pump is nanosecond; this allows us to investigate a wide time scale. We have observed bleaching of the lowest quantum peak with lifetimes of ∼2 microseconds. We interpret this in terms of trapped carriers. Phenomenological description of observed effect is also presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 737 , 2002 , E13.23
Copyright
Copyright © Materials Research Society 2003

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References

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