Enhanced UVB emission and analysis of chemical states of Ca 5(PO4)3OH:Gd3+,Pr3+ phosphor prepared by co-precipitation

P. P. Mokoena, I. M. Nagpure, Vinay Kumar, R. E. Kroon, E. J. Olivier, J. H. Neethling, H. C. Swart, O. M. Ntwaeaborwa

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60 Citations (Scopus)


Hydroxyapatite (Ca5(PO4)3OH) is a well-known bioceramic material used in medical applications because of its ability to form direct chemical bonds with living tissues. This mineral is currently used as a host for rare-earth ions (e.g. Gd3+, Pr 3+, Tb3+, etc.) to prepare phosphors that can be used in light emitting devices of different types. In this study Ca5(PO 4)3OH:Gd3+,Pr3+ phosphors were prepared by the co-precipitation method and were characterised by x-ray diffraction, x-ray photoelectron spectroscopy, scanning electron microscopy, high resolution transmission electron microscopy, energy dispersive x-ray spectroscopy and photoluminescence spectroscopy. The x-ray diffraction pattern was consistent with the hexagonal phase of Ca5(PO4) 3OH referenced in JCPDS card number 73-0293. The x-ray photoelectron spectroscopy data indicated that Ca2+ occupied two different lattice sites, referred to as Ca1 and Ca2. The photoluminescence data exhibited a narrowband emission located at 313 nm, which is associated with the 6P7/28S7/2 transition of the Gd3+ ion. This emission is classified as ultraviolet B and it is suitable for use in phototherapy lamps to treat various skin diseases. The photoluminescence intensity of the 313 nm emission was enhanced considerably by Pr3+ co-doping.

Original languageEnglish
Pages (from-to)998-1003
Number of pages6
JournalJournal of Physics and Chemistry of Solids
Issue number8
Publication statusPublished - Aug 2014
Externally publishedYes


  • A. Inorganic compounds
  • A. optical materials
  • C. photoelectron spectroscopy
  • D. crystal structure
  • D. luminescence

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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