Structural and optical studies of ZnAl 2 O 4 :x% Cu 2+ ( 0 < x ≤ 1.25 ) nanophosphors synthesized via citrate sol-gel route
2016; Elsevier BV; Volume: 64; Linguagem: Inglês
10.1016/j.optmat.2016.11.030
ISSN1873-1252
AutoresS.V. Motloung, F.B. Dejene, L.F. Koao, O.M. Ntwaeaborwa, H.C. Swart, Tshwafo E. Motaung, O.M. Ndwandwe,
Tópico(s)Transition Metal Oxide Nanomaterials
ResumoNanocrystalline ZnAl2O4:x% Cu2+(0<x≤1.25) phosphor powders were prepared via the citrate sol-gel technique. The pure-phase cubic structures in this systems were verified by the powder X-ray diffraction. Energy Dispersive x-ray Spectroscopy analysis confirmed the presence of the expected elements (Zn, Al, O and Cu). Scanning Electron Microscopy showed that the morphology of the phosphor was dependent on the concentration of Cu2+. High-Resolution Transmission Electron Microscopy confirmed that the Cu2+ concentration does not significantly influence the crystallites sizes of the phosphors. Ultraviolet–visible spectroscopy results showed that the Cu2+ concentration influenced the band gap of the host. Photoluminescence results showed that the emission intensity of the powder sample was dependent on the Cu2+ concentration. The emission from the host lattice was observed at 394 nm, while Cu2+ showed major emission at 405 and minor emission at 574 nm. The emission at 405 nm was due to the 3d84s1 → 3d9 transitions of Cu2+. The Commission on Illumination color coordinate evidently showed shifts from the bluewish to the greenish region with an increase in Cu2+ concentration.
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