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 |
ASJC Scopus subject areas
- Physics and Astronomy(all)
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Cite this
Klimov, V. I., & McBranch, D. W. (1998). Femtosecond 1P-to-1S electron relaxation in strongly confined semiconductor nanocrystals. Physical Review Letters, 80(18), 4028-4031.