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Article Dans Une Revue Superlattices and Microstructures Année : 2018

Structural and optical investigation of (V, Al) doped and co-doped ZnO nanopowders: Tailored visible luminescence for white light emitting diodes

Résumé

This paper deals with co-precipitation synthesis and characterization of undoped, Al, V doped, and (Al+V) co-doped ZnO nanopowders. Complementary techniques are used: X-ray diffraction (XRD), transmission electron microscopy (TEM), diffuse reflectance and photoluminescence (PL) spectroscopies. XRD analysis revealed the formation of hexagonal-wurtzite structure for all samples. The average crystallite size decreases from 40 to 20 nm by doping ZnO NPs. TEM images showed quasi-spherical shaped nanoparticles. The UV-visible absorption spectra revealed that doping and co-doping induce slight red-shift of gap energy (3.29eV-3.27eV). The Urbach energy increases mainly with V doping, suggesting an increase in disorder and defects levels. PL spectra exhibit narrow and wide emissions in UV and visible regions respectively. Gaussian deconvo-lution of the broad visible peaks revealed several overlapped emissions. Mainly V incorporation in ZnO (single and double doping) notably improves visible luminescence. It leads to widening of the visible emission from 460 to 585 nm.
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hal-01977991 , version 1 (11-01-2019)

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T. Elkar, N. Mzabi, M. Ben Hassine, P. Gemeiner, B. Dkhil, et al.. Structural and optical investigation of (V, Al) doped and co-doped ZnO nanopowders: Tailored visible luminescence for white light emitting diodes. Superlattices and Microstructures, 2018, 122, pp.349-361. ⟨10.1016/j.spmi.2018.07.015⟩. ⟨hal-01977991⟩
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