Pushing the band gap envelope: Mid-infrared emitting colloidal PbSe quantum dots

Jeffrey M. Pietryga, Richard D Schaller, Donald Werder, Michael H. Stewart, Victor I Klimov, Jennifer A. Hollingsworth

Research output: Contribution to journalArticle

327 Citations (Scopus)

Abstract

Efficient mid-infrared sources are of considerable general interest for gas analysis, remote sensing, and atmospheric monitoring, but existing technologies are limited. Here, we report the synthesis of the first colloidal QDs having photoluminescence (PL) in the mid-infrared. We show particle-size-tunable mid-infrared emission for large (10-17 nm), but quantum-confined, colloidal PbSe QDs, with efficient, narrow-bandwidth PL at energies as low as 0.30 eV (4.1 μm). Applying two new synthetic routes, we have achieved fine control of QD size and size distribution, allowing us to provide the first systematic correlation of QD size with PL energy for PbSe QDs emitting at wavelengths longer than 2 μm, results which are compared with a literature model. For the entire spectral range reported, we provide measured quantum yields in emission, showing a marked decrease with increasing QD size, for which we include a possible explanation. Finally, we present very promising preliminary results for overcoating PbSe with CdSe, a wider-gap semiconductor. We show PL enhanced by ∼6-fold for such core/shell samples.

Original languageEnglish
Pages (from-to)11752-11753
Number of pages2
JournalJournal of the American Chemical Society
Volume126
Issue number38
DOIs
Publication statusPublished - Sep 29 2004

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Quantum Dots
Semiconductor quantum dots
Photoluminescence
Energy gap
Infrared radiation
Semiconductors
Particle Size
Gas fuel analysis
Quantum yield
Gases
Technology
Remote sensing
Particle size
Semiconductor materials
Bandwidth
Wavelength
lead selenide
Monitoring

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Pushing the band gap envelope : Mid-infrared emitting colloidal PbSe quantum dots. / Pietryga, Jeffrey M.; Schaller, Richard D; Werder, Donald; Stewart, Michael H.; Klimov, Victor I; Hollingsworth, Jennifer A.

In: Journal of the American Chemical Society, Vol. 126, No. 38, 29.09.2004, p. 11752-11753.

Research output: Contribution to journalArticle

Pietryga, Jeffrey M. ; Schaller, Richard D ; Werder, Donald ; Stewart, Michael H. ; Klimov, Victor I ; Hollingsworth, Jennifer A. / Pushing the band gap envelope : Mid-infrared emitting colloidal PbSe quantum dots. In: Journal of the American Chemical Society. 2004 ; Vol. 126, No. 38. pp. 11752-11753.
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