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.
Keywords: 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
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)
Record created on 2006-02-27, modified on 2016-08-08