CdxHg(1-x)Te alloy colloidal quantum dots : Tuning optical properties from the visible to near-infrared by ion exchange

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Shuchi Gupta
  • Olga Zhovtiuk
  • Aleksandar Vaneski
  • Yan-Cheng Lin
  • Wu-Ching Chou
  • Stephen V. Kershaw

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)346-354
Journal / PublicationParticle and Particle Systems Characterization
Volume30
Issue number4
Publication statusPublished - Apr 2013

Abstract

The energy gap between valence and conduction levels in colloidal semiconductor quantum dots can be tuned via the nanoparticle diameter when this is comparable to or less than the Bohr radius. In materials such as cadmium mercury telluride, which readily forms a single phase ternary alloy, this quantum confinement tuning can also be augmented by compositional tuning, which brings a further degree of freedom in the bandgap engineering. Here it is shown that compositional control of 2.3 nm diameter CdxHg(1-x)Te nanocrystals by exchange of Hg2+ in place of Cd2+ ions can be used to tune their optical properties across a technologically useful range, from 500 nm to almost 1200 nm. Data on composition-dependent changes in the optical properties are provided, including bandgap, extinction coefficient, emission energy and spectral shape, Stokes shift, quantum efficiency, and radiative lifetimes as the exchange process occurs, which are highly relevant for those seeking to use these technologically important QD materials. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Research Area(s)

  • alloys, bandgap tuning, cation exchange, nanocrystals, nanoparticles

Citation Format(s)

CdxHg(1-x)Te alloy colloidal quantum dots : Tuning optical properties from the visible to near-infrared by ion exchange. / Gupta, Shuchi; Zhovtiuk, Olga; Vaneski, Aleksandar; Lin, Yan-Cheng; Chou, Wu-Ching; Kershaw, Stephen V.; Rogach, Andrey L.

In: Particle and Particle Systems Characterization, Vol. 30, No. 4, 04.2013, p. 346-354.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review