Multiexcitonic Dual Emission in CdSe/CdS Tetrapods and Nanorods

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• 作者：Andrey A. Lutich ; Christian Mauser ; Enrico Da Como ; Jing Huang ; Aleksandar Vaneski ; Dmitri V. Talapin ; Andrey L. Rogach ; Jochen Feldmann
• 刊名：Nano Letters
• 出版年：2010
• 出版时间：November 10, 2010
• 年：2010
• 卷：10
• 期：11
• 页码：4646-4650
• 全文大小：338K
• 年卷期：v.10,no.11(November 10, 2010)
• ISSN：1530-6992

文摘

CdSe/CdS semiconductor nanocrystal heterostructures are currently of high interest for the peculiar electronic structure offering unique optical properties. Here, we show that nanorods and tetrapods made of such material combination enable efficient multiexcitonic emission, when the volume of the nanoparticle is maximized. This condition is fulfilled by tetrapods with an arm length of 55 nm and results in a dual emission with comparable intensities from the CdS arms and CdSe core. The relative intensities of the dual emission, originating from exciton phase-space filling and reduced Auger recombination, can be effectively modulated by the photon fluence of the pump laser. The results, obtained under steady-state detection conditions, highlight the properties of tetrapods as multiexciton dual-color emitters.

Keywords:

Multiexcitons; nanocrystals; tetrapods; Auger recombination; dual emission