Optical emission of biaxial ZnO-ZnS nanoribbon heterostructures

Journal Article · Fri Feb 27 04:00:00 EST 2009 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3080767· OSTI ID:1005528

Murphy, M. W. ^[1]; Zhou, X. T. ^[1]; Ko, J. Y.P. ^[1]; Zhou, J G ^[1]; Heigl, F. ^[1]; Sham, T. K. ^[1]

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1. Univ. of Western Ontario, London, ON (Canada)

The electronic structure and optical properties of biaxial ZnO-ZnS heterostructure nanoribbons (NRs) have been investigated using x-ray absorption near-edge structures (XANES) and x-ray excited optical luminescence (XEOL). The XANES were recorded in total electron yield and wavelength-selected photoluminescence yield across the K- and L_3,2-edges of zinc and sulfur and the K-edge of oxygen. The XEOL from the NRs exhibit a very weak band-gap emission at 392 nm and two intense defect emissions at 491 and 531 nm. The synchrotron x-ray pulse (- 100 ps, 153 ns repetition rate) was used to track the optical decay dynamics from ZnO-ZnS NR, which can be described by two lifetimes (7.6 and 55 ns). Comparison with similar measurements for ZnO and ZnS nanowires reveals that the luminescence from ZnO-ZnS NRs was dominated by the ZnO component of the NR as the ZnS component contributes little. The implication of this observation is discussed.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1005528
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: (8) ; 2009 Vol. 130; ISSN JCPSA6; ISSN 0021-9606
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

43 PARTICLE ACCELERATORS
ABSORPTION
DECAY
DEFECTS
ELECTRONIC STRUCTURE
ELECTRONS
LUMINESCENCE
OPTICAL PROPERTIES
OXYGEN
PHOTOLUMINESCENCE
SULFUR
SYNCHROTRONS
ZINC