Synthesis and characterization of BaAl2O4:Eu 2+ co-doped with different rare earth ions

M. A. Lephoto, O. M. Ntwaeaborwa, Shreyas S. Pitale, H. C. Swart, J. R. Botha, B. M. Mothudi

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47 Citations (Scopus)

Abstract

Combustion method was used in this study to prepare BaAl2O 4:Eu2+ phosphors co-doped with different trivalent rare-earths (Re3+=Dy3+, Nd3+, Gd3+, Sm3+, Ce3+, Er3+, Pr3+ and Tb 3+) ions at an initiating temperature of 600°C. The phosphors were annealed at 1000°C for 3 h. As confirmed from the X-ray diffraction (XRD) data, both as prepared and post annealed samples crystallized in the well known hexagonal structure of BaAl2O4. All samples exhibited bluish-green emission associated with the 4f65d 1→4f7 transitions of Eu2+ at ∼500 nm. Although the highest intensity was observed from Er3+ co-doping, the longest afterglow (due to trapping and detrapping of charge carriers) was observed from Nd3+ followed by Dy3+ co-doping. The traps responsible for the long afterglow were studied using thermoluminescence (TL) spectroscopy.

Original languageEnglish
Pages (from-to)1603-1606
Number of pages4
JournalPhysica B: Condensed Matter
Volume407
Issue number10
DOIs
Publication statusPublished - 15 May 2012
Externally publishedYes

Keywords

  • Combustion synthesis
  • Phosphors
  • Photoluminescence
  • Thermoluminescence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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