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Improved photoluminescence and afterglow of CaTiO3:Pr3+ by ammonia treatment

Yoon, Songhak
Otal, Eugenio H.
Maegli, Alexandra E.
Karvonen, Lassi
Matam, Santhosh K.
Riegg, Stefan
Ebbinghaus, Stefan G.
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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 materialsRare-earth doped materials
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Research group Groupe Hagemann
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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

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Deposited on : 2013-02-19

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