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

被引：49

作者：

Bonati, C. ^{[1
]}

Cannizzo, A. ^{[1
]}

Tonti, D. ^{[1
]}

Tortschanoff, A. ^{[1
]}

van Mourik, F. ^{[1
]}

Chergui, M. ^{[1
]}

机构：

[1] Ecole Polytech Fed Lausanne, Lab Spect Ultrarapide, ISIC, Fac Sci Base,BSP, CH-1015 Lausanne, Switzerland

来源：

PHYSICAL REVIEW B | 2007年 / 76卷 / 03期

关键词：

D O I：

10.1103/PhysRevB.76.033304

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on the (sub)picosecond relaxation processes in PbSe quantum dots of different sizes, measured by a near-infrared photoluminescence upconversion technique. 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.

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页数：4

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