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Photoluminescence properties of Co-doped ZnO nanocrystals |
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| Authors: | Petra Lommens,Celso de Mello Donega,Luc Piraux,Stefan Má té fi-Tempfli,Zeger Hens |
| Affiliation: | a Physical Chemistry Laboratory, Ghent University, Krijgslaan 281-S12, B-9000 Ghent, Belgium b Department of Solid State Science, Ghent University, Krijgslaan 281-S1, B-9000 Ghent, Belgium c Debye Institute, Utrecht University, PO Box 80000, 3508 TA Utrecht, The Netherlands d Unité de Physico-Chimie et de Physique des Matériaux, Place Croix du Sud 1, 1348 Louvain-la-Neuve, Belgium |
| 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 8 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. |
| Keywords: | 75.50.Pp 78.55.Et 61.46.+w |
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