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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 2, Iss. 4 — Apr. 1, 2012
  • pp: 405–412

The influence of defects formed by Ca excess and thermal post-treatments on the persistent luminescence of CaTiO3:Pr

Eugenio H. Otal, Alexandra E. Maegli, Nina Vogel-Schäuble, Bernhard Walfort, Hans Hagemann, Songhak Yoon, Albert Zeller, and Anke Weidenkaff  »View Author Affiliations


Optical Materials Express, Vol. 2, Issue 4, pp. 405-412 (2012)
http://dx.doi.org/10.1364/OME.2.000405


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Abstract

Red emitting CaTiO3:Pr phosphors with a nominal composition of Ca0.998+xPr0.002TiO3+δ (0.02≤x≤0.04) were prepared by solid state reactions with different thermal post treatments and characterized by X-ray diffraction, transmission electron microscopy and photoluminescence. The Ca excess exhibited complete solubility up to 4% in the samples treated at 1400 °C but segregation in the form of Ruddlesden-Popper phases (Ca3Ti2O7 - Ca4Ti3O10) was observed in samples prepared at 1500 °C. The increase in temperature for stoichiometric samples showed a monotonic increase of decay time due to the reduction of non-radiative recombination defects. It was found that the Ca excess favored the formation of oxygen vacancies which are known to act as trap. In the samples treated at 1400 °C, 3% of Ca excess showed to be the best concentration to increase the decay time of persistent luminescence. For the samples treated at 1500 °C, the segregation of Ruddlesden-Popper phases left a constant amount of Ca soluble in all the CaTiO3 samples. This constant concentration of Ca caused the same density of defects and, consequently, the same decay time in all samples.

© 2012 OSA

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(160.4760) Materials : Optical properties
(160.5690) Materials : Rare-earth-doped materials

ToC Category:
Fluorescent and Luminescent Materials

History
Original Manuscript: December 19, 2011
Revised Manuscript: March 1, 2012
Manuscript Accepted: March 2, 2012
Published: March 7, 2012

Virtual Issues
Persistent Phosphors (2012) Optical Materials Express

Citation
Eugenio H. Otal, Alexandra E. Maegli, Nina Vogel-Schäuble, Bernhard Walfort, Hans Hagemann, Songhak Yoon, Albert Zeller, and Anke Weidenkaff, "The influence of defects formed by Ca excess and thermal post-treatments on the persistent luminescence of CaTiO3:Pr," Opt. Mater. Express 2, 405-412 (2012)
http://www.opticsinfobase.org/ome/abstract.cfm?URI=ome-2-4-405


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