Interplay between auger and ionization processes in nanocrystal quantum dots

被引：41

作者：

Kraus, RM

Lagoudakis, PG

Müller, J

Rogach, AL

Lupton, JM

Feldmann, J

Talapin, DV

Weller, H

机构：

[1] Univ Munich, Dept Phys, Photon & Optoelect Grp, D-80799 Munich, Germany

[2] Univ Munich, CeNS, D-80799 Munich, Germany

[3] Univ Hamburg, Inst Phys Chem, D-20146 Hamburg, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2005年 / 109卷 / 39期

关键词：

D O I：

10.1021/jp053671y

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：

We study the interplay between Auger effects and ionization processes in the limit of strong electronic confinement in core/shell CdSe/ZnS semiconductor nanocrystal quantum dots. Spectrally resolved fluorescence decay measurements reveal a monotonic increase of the photoluminescence decay rate on excitation density. Our results suggest that Auger recombination accelerates ionization processes that lead to the occupation of dark, nonemissive nanocrystal states. A model is proposed in the quantized Auger regime describing these experimental observations and providing an estimate of the Auger assisted ionization rates.

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页码：18214 / 18217

页数：4

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