Luminescence response and CL degradation of combustion synthesized spherical SiO2:Ce nanophosphor

I. M. Nagpure, Shreyas S. Pitale, K. G. Tshabalala, Vinay Kumar, O. M. Ntwaeaborwa, J. J. Terblans, H. C. Swart

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

This study was aimed to systematically investigate the luminescence response of SiO2:Ce3+ nanophosphors with different excitation sources. The powders were synthesized by using an urea assisted combustion method. SiO2:Ce1m% samples were also annealed at 1000 °C for 1 h in a charcoal environment to reduce incidental Ce 4+ to partial Ce3+ ions. High resolution transmission electron microscopy (HRTEM) images of the as synthesized and annealed powder samples confirmed that the particles were spherical and in the size range of 3-8 nm in diameter. X-ray diffraction (XRD) and electron dispersion spectroscopy (EDS) results showed that the SiO2 was crystalline and pure. Diffused reflectance, photoluminescence (PL) and cathodoluminescence (CL) results of the SiO2:Ce3+ samples were obtained and compared with each other. The CL degradation and the surface reactions on the surface of the SiO2:Ce3+ were studied with X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES). A clear improvement in the chemical stability of the SiO2:Ce3+ annealed at 1000 °C were obtained.

Original languageEnglish
Pages (from-to)2359-2366
Number of pages8
JournalMaterials Research Bulletin
Volume46
Issue number12
DOIs
Publication statusPublished - Dec 2011
Externally publishedYes

Keywords

  • A. Nanostructures
  • A. Optical materials
  • C. Photoelectron spectroscopy
  • C. X-ray diffraction
  • D. Luminescence
  • D. Surface properties

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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