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 language | English |
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Pages (from-to) | 97-103 |
Number of pages | 7 |
Journal | Solid State Sciences |
Volume | 48 |
DOIs | |
State | Published - 11 Aug 2015 |
Keywords
- Blue shift
- Eu
- Luminescence
- Thermal quenching
- Zirconium-based phosphate