Abstract
High-sensitivity femtosecond transient absorption is applied to directly measure the population-depopulation dynamics of the lowest (1S) and the first excited (1P) electron states in CdSe nanocrystals (NC's) of different radii with 1S - 1P energy separation up to 16 longitudinal optical phonon energies. Instead of the drastic reduction of the energy relaxation rate expected due to a phonon bottleneck, we observe a fast subpicosecond 1P-to-1S relaxation, with the rate enhanced in NC's of smaller radius. This indicates the opening of new confinement-enhanced relaxation channels which likely involve Auger-type electron-hole energy transfer.
| Original language | English |
|---|---|
| Pages (from-to) | 4028-4031 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 80 |
| Issue number | 18 |
| Publication status | Published - 1998 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Femtosecond 1P-to-1S electron relaxation in strongly confined semiconductor nanocrystals. / Klimov, Victor I; McBranch, Duncan W.
In: Physical Review Letters, Vol. 80, No. 18, 1998, p. 4028-4031.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Femtosecond 1P-to-1S electron relaxation in strongly confined semiconductor nanocrystals
AU - Klimov, Victor I
AU - McBranch, Duncan W.
PY - 1998
Y1 - 1998
N2 - High-sensitivity femtosecond transient absorption is applied to directly measure the population-depopulation dynamics of the lowest (1S) and the first excited (1P) electron states in CdSe nanocrystals (NC's) of different radii with 1S - 1P energy separation up to 16 longitudinal optical phonon energies. Instead of the drastic reduction of the energy relaxation rate expected due to a phonon bottleneck, we observe a fast subpicosecond 1P-to-1S relaxation, with the rate enhanced in NC's of smaller radius. This indicates the opening of new confinement-enhanced relaxation channels which likely involve Auger-type electron-hole energy transfer.
AB - High-sensitivity femtosecond transient absorption is applied to directly measure the population-depopulation dynamics of the lowest (1S) and the first excited (1P) electron states in CdSe nanocrystals (NC's) of different radii with 1S - 1P energy separation up to 16 longitudinal optical phonon energies. Instead of the drastic reduction of the energy relaxation rate expected due to a phonon bottleneck, we observe a fast subpicosecond 1P-to-1S relaxation, with the rate enhanced in NC's of smaller radius. This indicates the opening of new confinement-enhanced relaxation channels which likely involve Auger-type electron-hole energy transfer.
UR - http://www.scopus.com/inward/record.url?scp=0032482008&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032482008&partnerID=8YFLogxK
M3 - Article
VL - 80
SP - 4028
EP - 4031
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 18
ER -