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Fluorescence-line narrowing in CdSe quantum dots: Surface localization of the photogenerated exciton
Abstract
The electronic properties of shallow band-edge surface traps in nanometer-size CdSe quantum dots are probed using fluorescence-line-narrowing spectroscopy. We find large changes in electron-hole-pair radiative lifetimes and couplings to LO phonons as the temperature is changed from 1.75 to 10 K. We attribute these changes to the localization of the photogenerated hole at the surface of the dots, accompanied by thermally activated motion between these surface localized states. A simple model based on the observed exciton--LO-phonon couplings is constructed to estimate the extent of hole localization in the luminescing state. A size-dependent study (20--80 \AA{} diameter) indicates that surface effects diminish rapidly with increasing size.
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Citations
Cited by
Chemistry and Properties of Nanocrystals of Different Shapes
Burda, C., Chen, X., Narayanan, R., & El-Sayed, M. A. (2005) · Chemical Reviews · doi:10.1021/cr030063a · Cited by 7,230
Dabbousi, B. O., Rodriguez-Viejo, J., Mikulec, F. V., Heine, J. R., Mattoussi, H., Ober, R., Jensen, K. F., & Bawendi, M. G. (1997) · The Journal of Physical Chemistry B · doi:10.1021/jp971091y · Cited by 4,229
Self-citationObservation of the "Dark Exciton" in CdSe Quantum Dots
Nirmal, M., Norris, D. J., Kuno, M., Bawendi, M. G., Efros, A. L., & Rosen, M. (1995) · Physical Review Letters · doi:10.1103/physrevlett.75.3728 · Cited by 848
Self-citationMoriarty, P. (2001) · Reports on Progress in Physics · doi:10.1088/0034-4885/64/3/201 · Cited by 785
Long-range resonance transfer of electronic excitations in close-packed CdSe quantum-dot solids
Kagan, C. R., Murray, C. B., & Bawendi, M. G. (1996) · Physical Review B · doi:10.1103/physrevb.54.8633 · Cited by 744
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Metadata
- Authors
- Nirmal, M., Murray, C. B., & Bawendi, M. G.
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 1994-07-15
- Volume
- 50
- Issue
- 4
- Pages
- 2293-2300
- ISSN
- 0163-1829 (ISSN-L)
- 1095-3795
- OpenAlex
- W2085313826
- Cited by
- 272
- References
- 0
- FWCI
- 13.43
- Type
- journal article
- Language
- en
- Open access
- closed
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- Nirmal, M., Murray, C. B., & Bawendi, M. G. (1994). Fluorescence-line narrowing in CdSe quantum dots: Surface localization of the photogenerated exciton. Physical Review B. https://doi.org/10.1103/physrevb.50.2293
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