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 4T 1(P), 2T 1(G), 2E(G) → 4A 2(F) transition between Co 2+ d-levels located in regular Zn 2+ sites, [Co 2+] Zn and a broad near infrared emission band centred at 710 nm which has been interpreted as belonging to Co 2+ ions located in a perturbed Zn 2+ site, [ Co 2 + ] Zn ∗ . This study shows that the annealing treatment at 800 °C activates the diffusion of point defects thus creating more [Co 2+] Zn centres.
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