Abstract
Nd-doped ZnO:Al nanoparticles with various molar ratios of Nd/Al (0-0.0079) were synthesised by a sol-gel route. The synthesised powders were characterised by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), ultraviolet-visible spectrophotometry, and luminescent spectrophotometry. The XRD analysis indicated that the average particle size first slightly increased and then decreased as increasing Nd/Al ratio, whereas lattice parameter increased as increasing Nd/Al ratio. The FE-SEM analysis revealed a uniform granular particle morphology and the average particle sizes that first increases and then decreases with the increase of Nd content. The diffused reflection absorbance spectra in UV-visible light range revealed that smallest absorbance and widest optical band gap were observed as molar ratio of Nd/Al is 0.035. Moreover, the molar ratio of Nd/Al = 0.017 and 0.035 produced obviously enhanced visible luminescence efficiency originated from the increase of transparency and the formation of a new visible emission centre due to the defect introduced by Nd co-doping.
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