Luminescent properties of Ca0.97Al2O 4:Eu0.012+,Dy0.023+ phosphors prepared by combustion method at different initiating temperatures

B. M. Mothudi, O. M. Ntwaeaborwa, Shreyas S. Pitale, H. C. Swart

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Ca0.97Al2O4:Eu0.01 2+,Dy0.023+ powder phosphors were prepared by combustion method at different initiating temperatures (500-800 °C) using urea as a fuel. As confirmed by the X-ray diffraction (XRD) data, the powders crystallized in well known monoclinic phases of CaAl2O4, with traces of incidental impurities. Observed from the scanning electron microscopy (SEM) images were porous particles with irregular shapes and sizes and there were a lot of voids, which is a true reflection of the inherent nature of the combustion process. The PL spectra, recorded when the powders were excited by a 325 nm He-Cd laser at room temperature, showed broad blue emission with a maximum at 449 nm. This emission can be ascribed to 4f65d 1 to 4f7 transition of the Eu2+ ions. The maximum PL intensity was recorded from the sample prepared at the initiating temperature of 600 °C. Consistent with the PL emission data, the longer decay time was recorded from the same sample using Cary Eclipse spectrophotometer fitted with a monochromatized xenon lamp. The effect of initiating combustion temperature on the crystalline structure and PL intensity was investigated.

Original languageEnglish
Pages (from-to)262-265
Number of pages4
JournalJournal of Alloys and Compounds
Volume508
Issue number2
DOIs
Publication statusPublished - 22 Oct 2010
Externally publishedYes

Keywords

  • Aluminates
  • Combustion method
  • Phosphorescence
  • Photoluminescence

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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