Nanotechnology, volume 17, issue 4, pages 956-962

Highly efficient luminescence from a hybrid state found in strongly quantum confined PbS nanocrystals

Publication typeJournal Article
Publication date2006-01-30
Journal: Nanotechnology
Q2
Q2
SJR0.631
CiteScore7.1
Impact factor2.9
ISSN09574484, 13616528
General Chemistry
General Materials Science
Electrical and Electronic Engineering
Mechanical Engineering
Bioengineering
Mechanics of Materials
Abstract
We report that high quality PbS nanocrystals, synthesized in the strong quantum confinement regime, have quantum yields as high as 70% at room temperature. We use a combination of modelling and photoluminescence up-conversion to show that we obtain a nearly monodisperse size distribution. Nevertheless, the emission displays a large nonresonant Stokes shift. The magnitude of the Stokes shift is found to be directly proportional to the degree of quantum confinement, from which we establish that the emission results from the recombination of one quantum confined charge carrier with one localized or surface-trapped charge carrier. Furthermore, the surface state energy is found to lie outside the bulk bandgap so that surface-related emission only commences for strongly quantum confined nanocrystals, thus highlighting a regime where improved surface passivation becomes necessary.

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