Effect of Eu doping on the photoluminescence properties of ZnO nanophosphors for red emission applications

Vinod Kumar, Vijay Kumar, S. Som, M. M. Duvenhage, O. M. Ntwaeaborwa, H. C. Swart

Research output: Contribution to journalArticlepeer-review

110 Citations (Scopus)

Abstract

A simple and efficient combustion method was used to synthesize undoped ZnO and europium (Eu 3+ ) doped ZnO or ZnO:Eu 3+ nanophosphors (NPr). The X-ray diffraction pattern shows that the ZnO:Eu 3+ consists of a single phase wurtzite structure. The X-ray photoelectron spectra suggest that there were Eu 3+ ions present in the matrix of the sample at the lower concentration of Eu 3+ and confirmed the formation of Eu 2 O 3 at higher doping concentrations. ZnO native defect and Eu 3+ f-f transition related emissions were observed under excitation by a 325 nm He-Cd laser. The Judd-Ofelt intensity parameters (Ω t (t = 2, 4)) were estimated from the photoluminescence data. The value of Ω 2 at higher doping concentration (5 and 6 mol% of Eu 3+ ) was found to be higher than Ω 4 , pointing to more covalency and asymmetricity of Eu 3+ ions with ligands in the ZnO host. These ZnO:Eu 3+ NPrs have the potential for applications as source of red light in light emitting devices.

Original languageEnglish
Pages (from-to)419-430
Number of pages12
JournalApplied Surface Science
Volume308
DOIs
Publication statusPublished - 30 Jul 2014
Externally publishedYes

Keywords

  • Defects
  • Judd-Ofelt parameter
  • Red emission
  • TOF-SIMS
  • XPS

ASJC Scopus subject areas

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

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