Structural and optical studies of ZnAl2O4:x% Cu2+(0<x≤1.25) nanophosphors synthesized via citrate sol-gel route

S. V. Motloung*, F. B. Dejene, L. F. Koao, O. M. Ntwaeaborwa, H. C. Swart, T. E. Motaung, O. M. Ndwandwe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Nanocrystalline 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.

Original languageEnglish
Pages (from-to)26-32
Number of pages7
JournalOptical Materials
Publication statusPublished - 1 Feb 2017


  • CIE
  • Cu-doped
  • Luminescence
  • Sol-gel
  • ZnAlO


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