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Trap Effects in PbS Quantum Dots

Published online by Cambridge University Press:  01 February 2011

Peter D. Persans ,
Aleksey Filin ,
Feiran Huang ,
Andrew Vitek ,
Pratima G.N. Rao  and
Robert H. Doremus
Peter D. Persans
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, New York
Aleksey Filin
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, New York
Feiran Huang
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, New York
Andrew Vitek
Affiliation:
Department of Physics, Bethel College, Minnesota
Pratima G.N. Rao
Affiliation:
Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York
Robert H. Doremus
Affiliation:
Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York
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Abstract

We have found that traps can dominate important relaxation processes in PbS nanoparticles prepared by precipitation in borosilicate glass. The primary photoluminescence peak energy falls about 50 meV below the lowest absorption peak energy and has a long decay time of ∼4 μs. Photoinduced bleaching of the lowest absorption peak also has a long decay lifetime of ∼2 μs. Photoinduced bleaching also exhibits a surprisingly long rise time of hundreds of nanoseconds. Such long-lifetime effects must be attributed to multiple traps.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 789 , 2003 , N15.37
Copyright
Copyright © Materials Research Society 2004

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References

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