Exciton Formation at Solid-Solid Interfaces: a systematic experimental and ab initio Study on compressed MgO Nanopowders
Sternig A, Koller D, Siedl N, Diwald O, Mckenna K (2012)
Publication Type: Journal article
Publication year: 2012
Journal
Article Number: 120404111326000
DOI: 10.1021/jp3015222
Abstract
An important and so far neglected class of structural elements affecting the overall properties of metal oxide nanopowders are interfaces between individual nanocrystals. In this work we show experimentally that these defects inside a powder of compressed MgO nanocubes are subject to photoexcitation in the UV light range. In particular, we identify a so far unobserved photoluminescence emission process at 2.5 eV. First principles calculations of the optical properties of nanocrystal interfaces provide plausible candidates for both light absorbing and emitting sites which involve different types of interface features. It was found that edge dislocations that arise from interfaces between nanocube edges and terraces induce a significant electrostatic perturbation of the interfacial electronic states. This leads to exciton generation and luminescence at even lower energies than those related to corners and edges of MgO nanocubes
Authors with CRIS profile
Andreas Sternig
Professur für Partikelsynthese
Nicolas Siedl
Professur für Partikelsynthese
Oliver Diwald
Professur für Partikelsynthese
Additional Organisation(s)
Involved external institutions
Technische Universität Wien / Vienna University of Technology
Austria (AT)
University of York
United Kingdom (GB)
Austria (AT)
University of York
United Kingdom (GB)
How to cite
APA:
Sternig, A., Koller, D., Siedl, N., Diwald, O., & Mckenna, K. (2012). Exciton Formation at Solid-Solid Interfaces: a systematic experimental and ab initio Study on compressed MgO Nanopowders. Journal of Physical Chemistry C. https://dx.doi.org/10.1021/jp3015222
MLA:
Sternig, Andreas, et al. "Exciton Formation at Solid-Solid Interfaces: a systematic experimental and ab initio Study on compressed MgO Nanopowders." Journal of Physical Chemistry C (2012).
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