Pulsed laser deposition of a ZnO:Eu3+ thin film: Study of the luminescence and surface state under electron beam irradiation

E. H.H. Hasabeldaim, O. M. Ntwaeaborwa, R. E. Kroon, E. Coetsee-Hugo, H. C. Swart

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

A highly c-axis orientated Eu3+ doped ZnO (ZnO:Eu3+) thin film was successfully deposited by pulsed laser deposition in an oxygen working atmosphere. The structure, morphology, chemical analysis and luminescence properties of the sample were investigated. The effect of electron beam irradiation on the surface state, chemical and luminescence properties of the sample were studied. Successful incorporation of Eu3+ ions in the ZnO matrix was confirmed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis. XPS measurements revealed traces of the divalent (Eu2+) on the film surface while the trivalent (Eu3+) oxidation state in the bulk of the film. XPS depth profile confirmed that the film contained excess oxygen throughout the film. The film exhibited exciton and defect emission of ZnO as well as 4f – 4f characteristic emission of Eu3+ ions superimposed on the defect emission when excited at 325 nm using a He-Cd laser. Whereas only 4f – 4f characteristic emission of Eu3+ ions was recorded when the film was excited at 464 nm and also when excited with the electron beam. XPS high resolution spectra of the O 1s peak confirmed the creation of new defects during electron beam In general, ZnO:Eu3+ films show potential for applications as a source of red light in optoelectronic devices.

Original languageEnglish
Article number144281
JournalApplied Surface Science
Volume502
DOIs
Publication statusPublished - 1 Feb 2020
Externally publishedYes

Keywords

  • Cathodoluminescence
  • Degradation
  • Electron beam irradiation
  • Eu ions
  • PLD
  • Red emission
  • ZnO thin film

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Fingerprint

Dive into the research topics of 'Pulsed laser deposition of a ZnO:Eu3+ thin film: Study of the luminescence and surface state under electron beam irradiation'. Together they form a unique fingerprint.

Cite this