Long-lived quantum-confined infrared transitions in CdSe nanocrystals

D. S. Ginger; A. S. Dhoot; C. E. Finlayson; N. C. Greenham

doi:10.1063/1.1322369

Long-lived quantum-confined infrared transitions in CdSe nanocrystals

D. S. Ginger^*, A. S. Dhoot, C. E. Finlayson, N. C. Greenham

^*Corresponding author for this work

Department of Physics

University of Cambridge

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	2816-2818
Number of pages	3
Journal	Applied Physics Letters
Volume	77
Issue number	18
DOIs	https://doi.org/10.1063/1.1322369
Publication status	Published - 30 Oct 2000

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abstract = "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.",

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AU - Ginger, D. S.

AU - Dhoot, A. S.

AU - Finlayson, C. E.

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Y1 - 2000/10/30

N2 - 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.

AB - 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.

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JF - Applied Physics Letters

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Long-lived quantum-confined infrared transitions in CdSe nanocrystals

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