Spectral and dynamical characterization of multiexcitons in colloidal CdSe semiconductor quantum dots

被引：74

作者：

Bonati, C ^{[1
]}

Mohamed, MB ^{[1
]}

Tonti, D ^{[1
]}

Zgrablic, G ^{[1
]}

Haacke, S ^{[1
]}

van Mourik, F ^{[1
]}

Chergui, M ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW B | 2005年 / 71卷 / 20期

关键词：

D O I：

10.1103/PhysRevB.71.205317

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Femtosecond photoluminescence (PL) up-conversion studies in polychromatic mode and laser-power-dependence studies of the PL were carried out on colloidal solutions of CdSe quantum dots with diameters ranging from 2.4 to 4 nm. The main features of the spectra consist, in addition to the band-gap luminescence, of three bands, one 120-130 meV and another 30-40 meV at low energy to the band-gap luminescence, while the third lies 220-260 meV higher in energy. The first band is attributed to a positively charged biexciton and the second to a neutral biexciton, while the blue band is attributed to a neutral triexciton. These assignments are based on the energetics, the lifetimes, and the pump-power dependence of the various bands. The energetics and lifetimes are in good agreement with the theoretical studies present in literature.

引用

页数：6

共 23 条

[1] Energy spectrum of negatively charged single quantum dot: trion and charged biexciton states [J].