Slow-Injection Growth of Seeded CdSe/CdS Nanorods with Unity Fluorescence Quantum Yield and Complete Shell to Core Energy Transfer

被引：98

作者：

Coropceanu, Igor ^{[1
]}

Rossinelli, Aurelio ^{[2
]}

Caram, Justin R. ^{[1
]}

Freyria, Francesca S. ^{[1
]}

Bawendi, Moungi G. ^{[1
]}

机构：

[1] MIT, Dept Chem, Cambridge, MA 02139 USA

[2] ETH, Opt Mat Engn Lab, CH-8092 Zurich, Switzerland

来源：

ACS NANO | 2016年 / 10卷 / 03期

基金：

美国国家科学基金会;

关键词：

CdSe/CdS; nanorod; optical downshifting; LUMINESCENT SOLAR CONCENTRATORS; SEMICONDUCTOR NANORODS; NANOCRYSTALS; EFFICIENCY; HETEROSTRUCTURES; LINEWIDTHS; BLINKING; SHAPE;

D O I：

10.1021/acsnano.5b06772

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A two-step process has been developed for growing the shell of CdSe/CdS core/shell nanorods. The method combines an established fast-injection-based step to create the initial elongated shell with a second slow injection growth that allows for a systematic variation of the shell thickness while maintaining a high degree of monodispersity at the batch level and enhancing the uniformity at the single-nanorod level. The second growth step resulted in nanorods exhibiting a fluorescence quantum yield up to 100% as well as effectively complete energy transfer from the shell to the core. This improvement suggests that the second step is associated with a strong suppression of the nonradiative channels operating both before and after the thermalization of the exciton. This hypothesis is supported by the suppression of a defect band, ubiquitous to CdSe-based nanocrystals after the second growth.

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收藏

页码：3295 / 3301

页数：7

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