The role of Eu2+ concentration on the phase formation and spectroscopic properties of MZr4(PO4)6 (M2+ = Ca2+, Sr2+)

Zhi Jun Zhang, Woochul Yang

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The electronic structures of MZr4(PO4)6 (M2+ = Ca2+, Sr2+) were calculated using the CASTEP and the band gaps for CaZr4(PO4)6 and SrZr4(PO4)6 can reach up to 4.30 and 4.45 eV, respectively. Eu2+ doped MZr4(PO4)6 were prepared by solid-state reaction method. The XRD patterns, luminescence, decay curves and thermal quenching properties of the samples were investigated. The Eu2+ ion can be totally incorporated into MZr4(PO4)6 forming complete solid solutions. M1-xEuxZr4(PO4)6 (0.01 ≤ x ≤ 1) shows typical broad band emission in energy range from 1.91 to 3.11 eV originating from the 4f65d1 → 4f75d0 transition of Eu2+. With increasing Eu2+ concentration, there is an abnormal blue-shift of the emission for CaZr4(PO4)6:Eu2+ due to the decreasing crystal field strength and Stokes shift. However, there is no significant change in the position of the emission spectra in Eu2+-activated SrZr4(PO4)6. M0.97Eu0.03Zr4(PO4)6 shows the abnormal blue shift with decreasing emission intensity as an increase in temperature.

Original languageEnglish
Pages (from-to)97-103
Number of pages7
JournalSolid State Sciences
Volume48
DOIs
StatePublished - 11 Aug 2015

Keywords

  • Blue shift
  • Eu
  • Luminescence
  • Thermal quenching
  • Zirconium-based phosphate

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