The effects of re-firing process under oxidizing atmosphere and temperatures on the properties of strontium aluminate phosphors


Karacaoglu E., KARASU B.

MATERIALS RESEARCH BULLETIN, vol.48, no.10, pp.3702-3706, 2013 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 48 Issue: 10
  • Publication Date: 2013
  • Doi Number: 10.1016/j.materresbull.2013.05.078
  • Journal Name: MATERIALS RESEARCH BULLETIN
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.3702-3706
  • Keywords: ceramics, X-ray diffraction, crystal structure, luminescence, phosphors, LUMINESCENCE, REDUCTION, EU3+, EU2+, AIR
  • Anadolu University Affiliated: Yes

Abstract

Inorganic phosphorescent pigments have a very wide application, consisting of ceramic decoration and glazes. Therefore, in the present study 3 different commercially available strontium aluminate phosphors (coded Phosphor A, B and C) emitting yellowish-green light were investigated to determine their behaviour when re-fired under oxidizing atmosphere. The phosphors were re-fired at 10 different temperatures and consequent effects were studied. All the samples were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), laser particle size, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and fluorescence spectrometer analysis. It was found that firing them under oxidizing atmosphere strongly affected their phosphorescence abilities especially over 800-900 degrees C, because doped europium ions (Eu2+) in their structures are oxidized to Eu3+. It was also concluded that the phosphor powders clumped as the temperature rose, leading to their particle size distributions to change. (c) 2013 Elsevier Ltd. All rights reserved.