Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5404307 | Journal of Luminescence | 2006 | 6 Pages |
Abstract
We performed photoluminescence experiments on colloidal, Co2+-doped ZnO nanocrystals in order to study the electronic properties of Co2+ in a ZnO host. Room temperature measurements showed, next to the ZnO exciton and trap emission, an additional emission related to the Co2+ dopant. The spectral position and width of this emission does not depend on particle size or Co2+ concentration. At 8Â K, a series of ZnO bulk phonon replicas appear on the Co2+-emission band. We conclude that Co2+ ions are strongly localized in the ZnO host, making the formation of a Co2+d-band unlikely. Magnetic measurements revealed a paramagnetic behaviour.
Related Topics
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Physical and Theoretical Chemistry
Authors
Petra Lommens, Philippe F. Smet, Celso de Mello Donega, Andries Meijerink, Luc Piraux, Sebastien Michotte, Stefan Mátéfi-Tempfli, Dirk Poelman, Zeger Hens,