Recombination Dynamics of Band Edge Excitons in Quasi-Two-Dimensional CdSe Nanoplatelets

被引：113

作者：

Biadala, Louis ^{[1
,2
]}

Liu, Feng ^{[1
]}

Tessier, Mickael D. ^{[2
]}

Yakovlev, Dmitri R. ^{[1
,3
]}

Dubertret, Benoit ^{[2
]}

Bayer, Manfred ^{[1
]}

机构：

[1] Tech Univ Dortmund, D-44221 Dortmund, Germany

[2] ESPCI, Lab Phys & Etud Mat, CNRS, F-75231 Paris, France

[3] Russian Acad Sci, AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia

来源：

NANO LETTERS | 2014年 / 14卷 / 03期

关键词：

CdSe nanoplatelets; exciton; fine structure; dielectric confinement; dark exciton recombination; QUANTUM DOTS; LIFETIMES; EMISSION; NANOCRYSTALS; DEPENDENCE; DARK;

D O I：

10.1021/nl403311n

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report a time-resolved study of the photoluminescence of CdSe colloidal nanoplatelets with two different thicknesses. By studying the exciton recombination dynamics we assess the exciton fine structure in these systems. The splitting between bright and dark excitons is enhanced compared to epitaxial quantum well structures as result of dielectric confinement. Despite of strong variations in the absolute magnitude, by comparison with literature data we find a relatively slightly varying bright dark exciton lifetime ratio in very different CdSe-based colloidal nanostructures, regardless of growth technique and of core and shell properties such as materials, dimensions, etc. This finding points to a universal mechanism in the dark exciton recombination.

引用

页码：1134 / 1139

页数：6

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