Long-lived quantum-confined infrared transitions in CdSe nanocrystals

被引：31

作者：

Ginger, DS ^{[1
]}

Dhoot, AS ^{[1
]}

Finlayson, CE ^{[1
]}

Greenham, NC ^{[1
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

来源：

APPLIED PHYSICS LETTERS | 2000年 / 77卷 / 18期

关键词：

D O I：

10.1063/1.1322369

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present quasi-steady-state photoinduced absorption measurements on thin films of CdSe nanocrystals dispersed in a polystyrene matrix. For nanocrystals treated with pyridine we observe an intense, size-dependent absorption peaking in the mid-infrared when the samples are irradiated with visible light. This infrared absorption is associated with a size-dependent bleach in the visible, near the peak of the first excitonic absorption. We attribute the infrared absorption to an intraband electron transition in the quantum dots and measure the lifetime of the absorbing state to be 1.0 ms at 295 K. (C) 2000 American Institute of Physics. [S0003-6951(00)04344-8].

引用

页码：2816 / 2818

页数：3

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