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

Yoon, Songhak
Otal, Eugenio H.
Maegli, Alexandra E.
Karvonen, Lassi
Matam, Santhosh K.
Ebbinghaus, Stefan G.
Walfort, Bernhard
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Published in Journal of Alloys and Compounds. 2014, vol. 613, p. 338-343
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:PrFluorinationPersistent luminescenceAfterglowX-ray diffraction
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Research group Groupe Hagemann
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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. https://archive-ouverte.unige.ch/unige:38546

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Deposited on : 2014-07-08

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