Subpicosecond near-infrared fluorescence upconversion study of relaxation processes in PbSe quantum dots

The (sub)-ps relaxation processes in PbSe quantum dots of different sizes were measured by near-IR luminescence upconversion. The early-time spectra are characterized by emission from several low-lying excited states. The direct measurement of the Huang-Rhys factors of the lowest excited states excludes strong electron-phonon coupling in the intraband relaxation. The kinetics point to a fast sequential cascade process between excited states, governed by energy gaps and a quasicontinuous valence-band structure.


Published in:
Physical Review B, 76, 3, 033304/1-033304/4
Year:
2007
Keywords:
Note:
CAN 147:394352 73-5 Optical, Electron, and Mass Spectroscopy and Other Related Properties Laboratoire de Spectroscopie Ultrarapide, ISIC, Faculte des Sciences de Base, BSP,Ecole Polytechnique Federale de Lausanne (EPFL),Lausanne-Dorigny,Switz. Journal 1098-0121 written in English. 12069-00-0 (Lead monoselenide) Role: PRP (Properties) (sub-ps near-IR fluorescence upconversion of relaxation in quantum dots of)
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 Record created 2006-02-27, last modified 2018-06-15


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