Improved photoluminescence and afterglow of CaTiO<sub>3</sub>:Pr<sup>3+</sup> by ammonia treatment

Yoon, Songhak; Otal, Eugenio H.; Maegli, Alexandra E.; Karvonen, Lassi; Matam, Santhosh K.; Riegg, Stefan; Ebbinghaus, Stefan G.; Fallas Chinchilla, Juan Carlos; Hagemann, Hans-Rudolf; Walfort, Bernhard; Pokrant, Simone; Weidenkaff, Anke

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Title		Improved photoluminescence and afterglow of CaTiO₃:Pr³⁺ by ammonia treatment
Authors		Yoon, Songhak Otal, Eugenio H. Maegli, Alexandra E. Karvonen, Lassi Matam, Santhosh K. Riegg, Stefan Ebbinghaus, Stefan G. Fallas Chinchilla, Juan Carlos Hagemann, Hans-Rudolf Walfort, Bernhard Pokrant, Simone Weidenkaff, Anke show all authors [1 - 12]
Published in		Optical Materials Express. 2013, vol. 3, no. 2, p. 248
Abstract		The phosphor CaTiO3:Pr3+ was synthesized via a solid-state reaction in combination with a subsequent annealing under flowing NH3. Comparatively large off-center displacements of Ti in the TiO6 octahedra were confirmed for as-synthesized CaTiO3:Pr3 by XANES. Raman spectroscopy showed that the local crystal structure becomes highly symmetric when the powders are ammonolyzed at 400 °C. Rietveld refinement of powder X-ray diffraction data revealed that the samples ammonolyzed at 400 °C have the smallest lattice strain and at the same time the largest average Ti-O-Ti angles were obtained. The samples ammonolyzed at 400 °C also showed the smallest mass loss during the thermal re-oxidation in thermogravimetric analysis (TGA). Enhanced photolumincescence brightness and an improved decay curve as well as the highest reflectance were obtained for the samples ammonolyzed at 400 °C. The improved photoluminescence and afterglow by NH3 treatment are explained as a result of the reduced concentration of oxygen excesses with simultaneous relaxation of the lattice strain.
Keywords		Fluorescent materials — Rare-earth doped materials
Identifiers		DOI: 10.1364/OME.3.000248
Full text		Article (Published version) (1.4 MB) - Free access Other version: http://www.opticsinfobase.org/abstract.cfm?URI=ome-3-2-248
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 photoluminescence and afterglow of CaTiO₃:Pr³⁺ by ammonia treatment. In: Optical Materials Express, 2013, vol. 3, n° 2, p. 248. https://archive-ouverte.unige.ch/unige:26402