Energetics and dynamics of exciton-exciton interactions in compound colloidal semiconductor quantum dots

被引：21

作者：

Deutsch, Zvicka ^{[1
]}

Avidan, Assaf ^{[1
]}

Pinkas, Iddo ^{[2
]}

Oron, Dan ^{[1
]}

机构：

[1] Weizmann Inst Sci, Dept Phys Complex Syst, IL-76100 Rehovot, Israel

[2] Weizmann Inst Sci, Dept Plant Sci, IL-76100 Rehovot, Israel

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2011年 / 13卷 / 08期

关键词：

OPTICAL GAIN; CARRIER MULTIPLICATION; STIMULATED-EMISSION; CORE/SHELL NANOCRYSTALS; CDSE; FLUORESCENCE; CONFINEMENT; BIEXCITONS; BLINKING; ENERGY;

D O I：

10.1039/c0cp02253e

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The energetics and dynamics of multiply excited states in single material colloidal quantum dots have already been shown to exhibit universal trends. Here we attempt to identify similar trends in exciton-exciton interactions within compound colloidal quantum dots. For this end, we thoroughly review previously available data and also present experimental data on several newly synthesized systems, focusing on core/shell nanocrystals with a type-II band alignment. A universal condition for the transition from binding to repulsion of the biexciton (type-I-type-II transition) is established in terms of the change in the exciton radiative lifetime. A scaling rule is also presented for the magnitude of exciton-exciton repulsion. In contrast, we do not identify a clear universal scaling of the non-radiative Auger recombination lifetime of the biexciton state. Finally, a perspective on future applications of engineered multiexcitonic states is presented.

引用

页码：3210 / 3219

页数：10

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