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Applied Physics Letters / Volume 99 / Issue 24 / NANOSCALE SCIENCE AND DESIGN

Appl. Phys. Lett. 99, 243107 (2011); http://dx.doi.org/10.1063/1.3669511 (3 pages)

Temperature and size dependence of time-resolved exciton recombination in ZnO quantum dots

I. Musa1, F. Massuyeau1, L. Cario1, J. L. Duvail1, S. Jobic1, P. Deniard1, and E. Faulques1,2

1Institut des Matériaux Jean Rouxel, Université de Nantes, CNRS, UMR6502, 2 rue de la Houssinière, 44322 Nantes, France
2Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, United Kingdom

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(Received 22 October 2011; accepted 21 November 2011; published online 14 December 2011)

ZnO nanocrystals with various sizes were prepared and characterized. Their photoluminescence dynamics has been investigated at low temperatures. For the smallest particles (3 nm), a defect-induced long-lived photoluminescence occurs around 2.5 eV which is slowed down at decay times longer than 3 ns when sample temperature T decreases. From thermal quenching of the 2.5 eV band, the exciton dissociation energy at defect centers is estimated around ∼11.8 meV. For larger crystallites (10 and 20 nm), the ultraviolet emission observed at 3.32 eV decays in less than 85 ps and follows a Varshni law [Y. P. Varshni, Physica (Amsterdam) 34, 149 (1967)].

© 2011 American Institute of Physics

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KEYWORDS and PACS

Keywords

crystallites, defect states, dissociation energies, excitons, II-VI semiconductors, nanofabrication, nanoparticles, photoluminescence, quenching (thermal), semiconductor quantum dots, time resolved spectra, ultraviolet spectra, wide band gap semiconductors, zinc compounds

PACS

  • 78.67.Hc

    Quantum dots

  • 78.47.jd

    Time resolved luminescence

  • 71.35.Cc

    Intrinsic properties of excitons; optical absorption spectra

  • 78.55.Et

    II-VI semiconductors

  • 78.66.Hf

    II-VI semiconductors

  • 78.67.Bf

    Nanocrystals, nanoparticles, and nanoclusters

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3669511

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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