Laser sintering and influence of the Dy concentration on BaAl2O4:Eu2+, Dy3+persistent luminescence ceramics

This work reports the effect of the Dy concentration on the persistence luminescence properties of Eu doped barium aluminate (BaAl2O4) laser-sintered ceramics. For this study, the ceramics were first sintered using the laser sintering technique, based on a CO2 laser as the heating source, in an ambient atmosphere. The structural and morphology characteristics of the samples were investigated by x-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques, respectively. The laser-sintered ceramics presented are shown to be phase pure (single phased), and, for highest Dy concentration sample, a spurious Dy-rich phase at the grain boundary was observed. All samples exhibit the characteristic blue-green emission from the Eu2+ ion, due to the 4f65d1?4f7 transition (495 nm), even when they have been sintered in air. Finally, a clear dependence of the persistent luminescence intensity and decay time with the Dy concentration was verified.

Automated summary

This study investigated the effect of Dy concentration on the persistent luminescence properties of Eu doped barium aluminate laser-sintered ceramics. It was found that samples with higher Dy concentration exhibited a Dy-rich phase at the grain boundary, and there was a clear dependence of persistent luminescence intensity and decay time on Dy concentration.