Tunable and white emission from ZnO: Tb3+ nanophosphors for solid state lighting applications

Vinod Kumar, S. Som, Vijay Kumar, Vinay Kumar, O. M. Ntwaeaborwa, E. Coetsee, H. C. Swart

Research output: Contribution to journalArticlepeer-review

153 Citations (Scopus)

Abstract

Terbium doped Zinc oxide (ZnO:Tb3+) nano-phosphors (NPr) with a hexagonal wurtzite structure were synthesised by a solution combustion method. X-ray photoelectron spectroscopy confirmed the formation of different kind of defects for the undoped and lower Tb doping concentrations and the formation of Tb2O3 at higher doping concentrations. A broadband orange-red emission ranging from 500 to 850nm was obtained from the undoped ZnO while white light emission was observed from ZnO doped with 5mol% of Tb. The colour of the emission of the ZnO:Tb3+ NPr was tuned by varying the concentrations of Tb3+ in the ZnO host. The ZnO:Tb3+ NPr have potential applications in solid state lighting.

Original languageEnglish
Pages (from-to)541-552
Number of pages12
JournalChemical Engineering Journal
Volume255
DOIs
Publication statusPublished - 1 Nov 2014
Externally publishedYes

Keywords

  • Colour tunability
  • Defects
  • TOF-SIMS
  • White light emission
  • XPS

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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