Subpicosecond near-infrared fluorescence upconversion study of relaxation processes in PbSe quantum dots
2007
Résumé
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.
Détails
Titre
Subpicosecond near-infrared fluorescence upconversion study of relaxation processes in PbSe quantum dots
Auteur(s)
Bonati, C. ; Cannizzo, A. ; Tonti, D. ; Tortschanoff, A. ; Van Mourik, F. ; Chergui, M.
Publié dans
Physical Review B
Volume
76
Numéro
3
Pages
033304/1-033304/4
Date
2007
Mots-clés (libres)
Excited state (low-lying; of lead selenide quantum dots); Fluorescence up-conversion (near-IR sub-ps; of relaxation in lead selenide quantum dots); IR spectra (near-IR; of lead selenide quantum dots); Band gap; Valence band (of lead selenide quantum dots); Quantum dot devices (sub-ps near-IR fluorescence upconversion of relaxation in lead selenide); lead selenide quantum dot near IR fluorescence upconversion; relaxation
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)
Autres identifiant(s)
DAR: 10959
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Laboratoires
LSU
Le document apparaît dans
Production scientifique et compétences > SB - Faculté des sciences de base > ISIC - Institut des sciences et ingénierie chimiques > LSU - Laboratoire de spectroscopie ultrarapide
Publications validées par des pairs
Travail produit à l'EPFL
Articles de journaux
Publié
Publications validées par des pairs
Travail produit à l'EPFL
Articles de journaux
Publié
Date de création de la notice
2006-02-27