Scientific article
Open access

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

Published inOptical materials express, vol. 3, no. 2, 248
Publication date2013

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.

  • Fluorescent materials
  • Rare-earth doped materials
Research group
Citation (ISO format)
YOON, Songhak et al. Improved photoluminescence and afterglow of CaTiO<sub>3</sub>:Pr<sup>3+</sup> by ammonia treatment. In: Optical materials express, 2013, vol. 3, n° 2, p. 248. doi: 10.1364/OME.3.000248
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Article (Published version)
ISSN of the journal2159-3930

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Creation02/05/2013 8:16:00 AM
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