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

Research output: Contribution to journalArticlepeer-review

38 Citations (SciVal)

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 languageEnglish
Pages (from-to)2816-2818
Number of pages3
JournalApplied Physics Letters
Volume77
Issue number18
DOIs
Publication statusPublished - 30 Oct 2000

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