Characterization of annealed Eu3+-doped ZnO flower-like morphology synthesized by chemical bath deposition method

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Undoped and europium ion (Eu3+) doped ZnO nanostructures were synthesized via the chemical bath deposition method and annealed afterwards in air at 700 °C. The X-ray diffraction measurements confirmed the hexagonal wurtzite structure for all samples. The scanning electron microscopy (SEM) revealed that the nanopowder samples were assembled in flower-like shapes for undoped and hexagonal-shaped for Eu3+-doped ZnO. Elemental energy dispersive (EDS) analysis mapping conducted on the samples revealed homogeneous distribution of Zn, O, and Eu ions. The Ultraviolet–visible (UV–vis) diffusion reflectance spectroscopy showed a decrease in the band gap with an increasing Eu3+ concentration. The photoluminescence (PL) results showed that by exciting Eu3+ (4 mol%) doped ZnO with different excitation wavelength the highest luminescence intensity was observed at an excitation wavelength of 395 nm but no emissions were observed from Eu3+. By exciting further with 465 nm the Eu3+ emissions were observed and emission from undoped ZnO was found for the first time.

Original languageEnglish
Pages (from-to)294-304
Number of pages11
JournalOptical Materials
Volume60
DOIs
Publication statusPublished - 1 Oct 2016

Keywords

  • Luminescence
  • Nanostructures
  • Optical properties
  • X-ray diffraction

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