Scientific article
English

Improved persistent luminescence of CaTiO3:Pr by fluorine substitution and thermochemical treatment

Published inJournal of alloys and compounds, vol. 613, p. 338-343
Publication date2014
Abstract

Fluorine-substituted CaTiO3:Pr phosphors were prepared by a solid-state reaction. Rietveld refinements of powder X-ray diffraction patterns revealed that increasing fluorine-substitution leads to the gradual shrinkage of the unit-cell. Enhanced afterglow intensities were observed with fluorine-substitution. Furthermore, the effect of annealing atmosphere was investigated by thermochemical treatment in different atmospheres (Ar, air and NH3). UV-Vis diffuse reflectance spectra and photoluminescence excitation spectra revealed that Pr4+ in the pristine CaTi(O,F)3:Pr phosphor was partially reduced to Pr3+ under NH3 flow leading to an intensity improvement of ca. 450% compared to CaTiO3:Pr. The substantial improvement of afterglow intensity by fluorine substitution and annealing in NH3 is considered to be connected with the generation of oxygen vacancies and the partial reduction of Pr4+ to Pr3+.

Keywords
  • CaTiO3:Pr
  • Fluorination
  • Persistent luminescence
  • Afterglow
  • X-ray diffraction
Research groups
Citation (ISO format)
YOON, Songhak et al. Improved persistent luminescence of CaTiO3:Pr by fluorine substitution and thermochemical treatment. In: Journal of alloys and compounds, 2014, vol. 613, p. 338–343. doi: 10.1016/j.jallcom.2014.06.041
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Article (Published version)
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Identifiers
Journal ISSN0925-8388
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First validation03/07/2014 08:06:00
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