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Open Access research which pushes advances in bionanotechnology

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SIPBS is a major research centre in Scotland focusing on 'new medicines', 'better medicines' and 'better use of medicines'. This includes the exploration of nanoparticles and nanomedicines within the wider research agenda of bionanotechnology, in which the tools of nanotechnology are applied to solve biological problems. At SIPBS multidisciplinary approaches are also pursued to improve bioscience understanding of novel therapeutic targets with the aim of developing therapeutic interventions and the investigation, development and manufacture of drug substances and products.

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Low-symmetry Td-distorted Co2+ centres in ceramic ZnO:Co

Han, T.P.J. and Villegas, M. and Peiteado, M. and Caballero, A.C. and Rodríguez, F. and Jaque, F. (2010) Low-symmetry Td-distorted Co2+ centres in ceramic ZnO:Co. Chemical Physics Letters, 488 (4-6). pp. 173-176. ISSN 0009-2614

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Abstract

The reflectivity and photoluminescence of cobalt-doped ZnO ceramics samples have been studied by optical spectroscopy. The result reveals, in addition to the emission bands associated with intrinsic defects, weak narrow emission peaks which are ascribed to a mixed 4T1(P), 2T1(G), 2E(G) → 4A2(F) transition between Co2+ d-levels located in regular Zn2+ sites, [Co2+]Zn and a broad near infrared emission band centred at 710 nm which has been interpreted as belonging to Co2+ ions located in a perturbed Zn2+ site, . This study shows that the annealing treatment at 800 °C activates the diffusion of point defects thus creating more [Co2+]Zn centres.