XRD traces and SEM images of (a) K2ZrF6:Mn4+ and (b) Na2ZrF6:Mn2+. The XRD patterns obtained from the ASTM cards are also plotted (m-K2ZrF6: #00-044-0843; c-K3ZrF7: #00-010-0372; m-Na2ZrF6: #01-071-1186).
EPMA spectrum of Na2ZrF6:Mn2+.
PL and PLE spectra of (a) K2ZrF6:Mn4+ (K3ZrF7:Mn4+) and (b) Na2ZrF6:Mn2+ at 300 K.
PL spectrum of Na2ZrF6:Mn2+ at 20 K, together with those of K2SiF6:Mn2+ (Ref. 15) and Na2SiF6:Mn2+ (Ref. 16).
PL spectra measured at temperatures between 20 and 300 K for (a) K2ZrF6:Mn4+ (K3ZrF7:Mn4+) and (b) Na2ZrF6:Mn2+. The dashed line in (a) represents the position of the ZPL energy (∼2.00 eV).
Integrated PL emission intensity I PL vs temperature T for K2ZrF6:Mn4+ (K3ZrF7:Mn4+) and Na2ZrF6:Mn2+. The light and heavy solid lines show the results calculated using Eqs. (4) and (5), respectively.
PL spectrum of Na2ZrF6:Mn2+ at 20 K. The vertical bars represent the statistical Poisson distribution given by Eq. (9) with S = 1.
FT spectrum calculated using Eq. (6) and 20 K PL data in Fig. 7.
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