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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 2, Iss. 3 — Mar. 1, 2012
  • pp: 321–330

Valence states of europium in CaAl2O4:Eu phosphors

Nursen Avci, Katleen Korthout, Mark A. Newton, Philippe F. Smet, and Dirk Poelman  »View Author Affiliations


Optical Materials Express, Vol. 2, Issue 3, pp. 321-330 (2012)
http://dx.doi.org/10.1364/OME.2.000321


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Abstract

Persistent luminescent CaAl2O4:Eu2+,Nd3+ powders were prepared by a non-aqueous sol-gel technique. The crystallization of calcium aluminate by heat-treatment of the sols is described in detail. After heat treatment in air, the europium dopant ions are mainly in a trivalent state. For the reduction to the divalent state post-annealing in a reducing nitrogen-hydrogen atmosphere is used. The reduction of europium ions is monitored by photoluminescence and x-ray absorption (XANES) spectroscopy. The degree of reduction is strongly dependent on the annealing temperature. Although for high temperature a strong enhancement of the Eu2+ emission is observed, this also leads to powders with a gray body color.

© 2012 OSA

OCIS Codes
(160.2900) Materials : Optical storage materials
(160.5690) Materials : Rare-earth-doped materials
(160.6060) Materials : Solgel
(250.5230) Optoelectronics : Photoluminescence
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
(300.6560) Spectroscopy : Spectroscopy, x-ray

ToC Category:
Fluorescent and Luminescent Materials

History
Original Manuscript: January 3, 2012
Revised Manuscript: February 14, 2012
Manuscript Accepted: February 18, 2012
Published: February 23, 2012

Virtual Issues
Persistent Phosphors (2012) Optical Materials Express

Citation
Nursen Avci, Katleen Korthout, Mark A. Newton, Philippe F. Smet, and Dirk Poelman, "Valence states of europium in CaAl2O4:Eu phosphors," Opt. Mater. Express 2, 321-330 (2012)
http://www.opticsinfobase.org/ome/abstract.cfm?URI=ome-2-3-321


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References

  1. A. Gaki, T. Perraki, and G. Kakali, “Wet chemical synthesis of monocalcium aluminate,” J. Eur. Ceram. Soc.27(2-3), 1785–1789 (2007). [CrossRef]
  2. S. Iftekhar, J. Grins, G. Svensson, J. Loof, T. Jarmar, G. A. Botton, C. M. Andrei, and H. Engqvist, “Phase formation of CaAl2O4 from CaCO3-Al2O3 powder mixtures,” J. Eur. Ceram. Soc.28(4), 747–756 (2008). [CrossRef]
  3. J. M. R. Mercury, A. H. De Aza, and P. Pena, “Synthesis of CaAl2O4 from powders: Particle size effect,” J. Eur. Ceram. Soc.25(14), 3269–3279 (2005). [CrossRef]
  4. B. M. Mohamed and J. H. Sharp, “Kinetics and mechanism of formation of monocalcium aluminate, CaAl2O4,” J. Mater. Chem.7(8), 1595–1599 (1997). [CrossRef]
  5. V. Singh, V. Natarajan, and D. K. Kim, “Characterisation and luminescence investigations of Mn doped CaAl2O4 phosphor prepared by combustion,” Int. J. Mod. Phys. B22(13), 2095–2099 (2008). [CrossRef]
  6. X. J. Wang, D. D. Jia, and W. M. Yen, “Mn2+ activated green, yellow, and red long persistent phosphors,” J. Lumin.102-103, 34–37 (2003). [CrossRef]
  7. S. Janáková, L. Salavcova, G. Renaudin, Y. Filinchuk, D. Boyer, and P. Boutinaud, “Preparation and structural investigations of sol-gel derived Eu3+-doped CaAl2O4,” J. Phys. Chem. Solids68(5-6), 1147–1151 (2007). [CrossRef]
  8. K. Van den Eeckhout, P. F. Smet, and D. Poelman, “Persistent Luminescence in Eu2+-Doped Compounds: A Review,” Materials3(4), 2536–2566 (2010). [CrossRef]
  9. J. Hölsä, T. Laamanen, M. Lastusaari, M. Malkamaki, E. Welter, and D. A. Zajac, “Valence and environment of rare earth ions in CaAl2O4:Eu2+,R3+ persistent luminescence materials,” Spectrochim. Acta, B At. Spectrosc.65(4), 301–305 (2010). [CrossRef]
  10. T. Aitasalo, J. Hölsä, H. Jungner, M. Lastusaari, and J. Niittykoski, “Sol-gel processed Eu2+-doped alkaline earth aluminates,” J. Alloy. Comp.341(1-2), 76–78 (2002). [CrossRef]
  11. A. Douy and M. Gervais, “Crystallization of amorphous precursors in the calcia-alumina system: A differential scanning calorimetry study,” J. Am. Ceram. Soc.83(1), 70–76 (2000). [CrossRef]
  12. S. W. Choi and S. H. Hong, “Size and morphology control by planetary ball milling in CaAl2O4:Eu2+ phosphors prepared by Pechini method and their luminescence properties,” Mater. Sci. Eng. B171(1-3), 69–72 (2010). [CrossRef]
  13. V. Singh, J. J. Zhu, M. K. Bhide, and V. Natarajan, “Synthesis, characterisation and luminescence investigations of Eu activated CaAl2O4 phosphor,” Opt. Mater.30(3), 446–450 (2007). [CrossRef]
  14. C. K. Chang, J. Xu, L. Jiang, D. L. Mao, and W. J. Ying, “Luminescence of long-lasting CaAl2O4: Eu2+,Nd3+ phosphor by co-precipitation method,” Mater. Chem. Phys.98(2-3), 509–513 (2006). [CrossRef]
  15. W. Y. Jia, H. B. Yuan, L. Z. Lu, H. M. Liu, and W. M. Yen, “Crystal growth and characterization of Eu2+, Dy3+: SrAl2O4 and Eu2+, Nd3+: CaAl2O4 by the LHPG method,” J. Cryst. Growth200(1-2), 179–184 (1999). [CrossRef]
  16. T. Katsumata, T. Nabae, K. Sasajima, and T. Matsuzawa, “Growth and characteristics of long persistent SrAl2O4- and CaAl2O4-based phosphor crystals by a floating zone technique,” J. Cryst. Growth183(3), 361–365 (1998). [CrossRef]
  17. T. Aitasalo, J. Hölsä, H. Jungner, M. Lastusaari, J. Niittykoski, M. Parkkinen, and R. Valtonen, “Eu2+ doped calcium aluminates prepared by alternative low temperature routes,” Opt. Mater.26(2), 113–116 (2004). [CrossRef]
  18. M. Murayama, N. Takeuchi, Y. Aoki, and T. Matsuzawa, “Phosphorescent phosphor,” US Patent 5424006 (1995).
  19. J. Hölsä, H. Jungner, M. Lastusaari, and J. Niittykoski, “Persistent luminescence of Eu2+ doped alkaline earth aluminates, MAl2O4:Eu2+,” J. Alloy. Comp.323-324, 326–330 (2001). [CrossRef]
  20. Y. H. Lin, Z. L. Tang, Z. T. Zhang, and C. W. Nan, “Influence of co-doping different rare earth ions on the luminescence of CaAl2O4-based phosphors,” J. Eur. Ceram. Soc.23(1), 175–178 (2003). [CrossRef]
  21. X. Y. Chen, Z. Li, S. P. Bao, and P. T. Ji, “Porous MAl2O4:Eu2+ (Eu3+), Dy3+ (M = Sr, Ca, Ba) phosphors prepared by Pechini-type sol-gel method: The effect of solvents,” Opt. Mater.34(1), 48–55 (2011). [CrossRef]
  22. D. Ravichandran, S. T. Johnson, S. Erdei, R. Roy, and W. B. White, “Crystal chemistry and luminescence of the Eu2+-activated alkaline earth aluminate phosphors,” Displays19(4), 197–203 (1999). [CrossRef]
  23. T. Aitasalo, J. Hölsä, H. Jungner, M. Lastusaari, and J. Niittykoski, “Comparison of sol-gel and solid-state prepared Eu2+ doped calcium aluminates,” Mater. Sci.20, 15–20 (2002).
  24. C. Ronda, “(Y,Gd)2O3:Eu3+,” in Luminescence From Theory to Applications (Wiley-VCH, Weinheim, 2008).
  25. G. Kaindl, G. Schmiester, E. V. Sampathkumaran, and P. Wachter, “Pressure-induced changes in LIII x-ray-absorption near-edge structure of CeO2 and CeF4: Relevance to 4f-electronic structure,” Phys. Rev. B Condens. Matter38(14), 10174–10177 (1988). [CrossRef] [PubMed]
  26. Y. Takahashi, G. R. Kolonin, G. P. Shironosova, T. Kupriyanova, T. Uruga, and H. Shimizu, “Determination of the Eu(II)/Eu(III) ratios in minerals by X-ray absorption near-edge structure (XANES) and its application to hydrothermal deposits,” Mineral. Mag.69(2), 179–190 (2005). [CrossRef]
  27. K. Korthout, K. Van den Eeckhout, J. Botterman, S. Nikitenko, D. Poelman, and P. F. Smet, “Luminescence and x-ray absorption measurements of persistent SrAl2O4:Eu,Dy powders: Evidence for valence state changes,” Phys. Rev. B84(8), 085140 (2011). [CrossRef]

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