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Exciton Lifetime in PbS Quantum Dots in Glass

Published online by Cambridge University Press:  26 February 2011

Peter D Persans ,
A. Filin ,
N. E. Berry ,
F. Huang  and
E. Chan
Peter D Persans
Affiliation:
persap@rpi.edu, rensselaer Polytechnic Institute, Physics, 110 Eighth Street, Troy, NY, 12180, United States, 518-276-2934, 518-276-6680
A. Filin
Affiliation:
filin@rpi.edu, Rensselaer Polytechnic Institute, Physics, 110 Eighth Street, Troy, NY, 12180, United States
N. E. Berry
Affiliation:
neberry@aol.com, Rensselaer Polytechnic Institute, Physics, 110 Eighth Street, Troy, NY, 12180, United States
F. Huang
Affiliation:
huangf@rpi.edu, Rensselaer Polytechnic Institute, Physics, 110 Eighth Street, Troy, NY, 12180, United States
E. Chan
Affiliation:
chane@rpi.edu, Rensselaer Polytechnic Institute, Physics, 110 Eighth Street, Troy, NY, 12180, United States
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Abstract

We report experimental measurements and analysis of HOMO-LUMO transition photoluminescence and photoinduced bleaching magnitude and decay kinetics in lead sulfide quantum dots in glass. We find that the radiative lifetime is independent of temperature from 77K to 500K. The lifetime of the HOMO-LUMO state decreases dramatically for T>300K, indicating thermally activated nonradiative recombination. The excitation decay time is much greater than the radiative lifetime and increases monotonically with decreasing temperature with decay times of 2 μs at room temperature and 4-10 μs at 77K.

Keywords

luminescencenanostructureoptical
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 974: Symposium CC – Solar Energy Conversion , 2006 , 0974-CC06-01
Copyright
Copyright © Materials Research Society 2007

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References

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