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Title

Improved persistent luminescence of CaTiO3:Pr by fluorine substitution and thermochemical treatment
Authors
Yoon, Songhak
Otal, Eugenio H.
Maegli, Alexandra E.
Karvonen, Lassi
Matam, Santhosh K.
Ebbinghaus, Stefan G.
Walfort, Bernhard
Hagemann, Hans-Rudolf
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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:Pr — Fluorination — Persistent luminescence — Afterglow — X-ray diffraction
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Other version: http://linkinghub.elsevier.com/retrieve/pii/S0925838814013759
Structures
Faculté des sciences / Section de chimie et biochimie / Département de chimie physique
Research group Groupe Hagemann
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. https://archive-ouverte.unige.ch/unige:38546

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Deposited on : 2014-07-08

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