Efficient UV-emitting X-ray phosphors: Octahedral Zr(PO4) 6 luminescence centers in potassium hafnium-zirconium phosphates K2Hf1-xZrx(PO4)2 and KHf2(1-x)Zr2x(PO4)3

C. C. Torardi, C. R. Miao, J. Li

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


Potassium hafnium-zirconium phosphates, K2Hf 1-xZrx(PO4)2 and KHf 2(1-x)Zr2x(PO4)3, are broad-band UV-emitting phosphors. At room temperature, they have emission peak maxima at approximately 322 and 305nm, respectively, under 30kV peak molybdenum X-ray excitation. Both phosphors demonstrate luminescence efficiencies that make them up to ∼60% as bright as commercially available CaWO4 Hi-Plus. The solid-state and flux synthesis conditions, and X-ray excited UV luminescence of these two phosphors are discussed. Even though the two compounds have different atomic structures, they contain zirconium in the same active luminescence environment as that found in highly efficient UV-emitting BaHf1-xZrx(PO4)2. All the three materials have hafnium and zirconium in octahedral coordination via oxygen-atom corner sharing with six separate PO4 tetrahedra. This octahedral Zr(PO4)6 moiety appears to be an important structural element for efficient X-ray excited luminescence, as are the edge-sharing octahedral TaO6 chains for tantalate emission.

Original languageEnglish
Pages (from-to)289-293
Number of pages5
JournalJournal of Solid State Chemistry
Issue number2
Publication statusPublished - Feb 1 2003


  • Potassium hafnium-zirconium phosphate
  • Tantalum luminescence
  • UV emission
  • X-ray phosphor
  • Zirconium luminescence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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