Photoluminescence properties of un-doped and Mn-doped ZnO nanostructures

Abstract

We presented combinations of vapor phase transport (VPT) of mixture of methanol and acetone and thermal evaporation of brass (CuZn) which contain in-situ three stages in obtaining un-doped and Mn-doped zinc oxide (ZnO) nanostructures (NSs). The structure and morphology were characterized by energy dispersive X-ray analysis (EDAX), field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). The role of Ar as feed gas and interaction between methanol and brass have been predicted based on work reported elsewhere. Photoluminescence (PL) properties of un-doped and Mn-doped ZnO showed significant changes in the optical properties providing evidence for several types of defects such as zinc interstitials (Zni), oxygen interstitials (Oi), zinc vacancy (VZn), singly charged zinc vacancy (V − ), oxygen vacancy (Vo), singly charged oxygen vacancy (V +) and oxygen antisite defects (OZn) in the grown NS. The Mn-doped ZnO NSs have exhibited shifted PL peaks compared to the un-doped ZnO.