Effect of annealing conditions on the luminescence properties and thermometric performance of Sr3Al2O5Cl2:Eu2+ and SrAl2O4:Eu2+ phosphors

Divalent europium emission from distinct sites in the Sr 3 Al 2 O 5 Cl 2 host results in two emission bands. The ratio of intensities of these bands is strongly temperature sensitive and can be exploited for two colour ratio-based luminescence thermometry.