Colloidal CdSe/CdS Dot-in-Plate Nanocrystals with 2D-Polarized Emission

被引：101

作者：

Cassette, Elsa ^{[1
]}

Mahler, Benoit ^{[1
]}

Guigner, Jean-Michel ^{[2
]}

Patriarche, Gilles ^{[3
]}

Dubertret, Benoit ^{[1
]}

Pons, Thomas ^{[1
]}

机构：

[1] UPMC, ESPCI, CNRS,UMR 8213, Lab Phys & Etud Mat, F-75005 Paris, France

[2] UPMC, IRD, CNRS,UMR 7590, Inst Mineral & Phys Milieux Condenses, F-75252 Paris 05, France

[3] CNRS, UPR20, Lab Photon & Nanostruct, Route Nozay, F-91460 Marcoussis, France

来源：

ACS NANO | 2012年 / 6卷 / 08期

关键词：

oblate core/shell nanocrystals; heavy hole to light hole band splitting; 2D polarization; anisotropic pressure; spontaneous orientation; QUANTUM DOTS; SEMICONDUCTOR NANOCRYSTALS; SEEDED-GROWTH; ELECTRONIC-STRUCTURE; HETEROSTRUCTURES; NANORODS; EXCITON; ROD; PHOTOLUMINESCENCE; POLARIZATION;

D O I：

10.1021/nn3024255

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report the synthesis and properties of a novel class of nanocrystals with mixed dimensionality: a dot-in-plate core/shell nanostructure. This system was synthesized by growing a flat, disk-shaped, CdS shell on spherical CdSe cores. The anisotropic pressure induced by the shell drastically splits the first exciton fine structure in two: the "heavy hole" and "light hole" states become separated by up to 65 meV. As a result, these nanocrystals exhibit an emission strongly polarized in two dimensions, in the plane perpendicular to the wurtzite crystal c axis. We use polarization measurements on single nanocrystals and ensemble anisotropy studies to confirm the nature and position of the excitonic energy levels. These nanocrystals orient spontaneously when evaporated on a substrate, enabling a precise control of the orientation of their emission dipole.

引用

页码：6741 / 6750

页数：10

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