Journal of Luminescence (2009)

Persistent luminescence in rare-earth codoped Ca2Si5N8:Eu2+
Koen Van den Eeckhout, Philippe F. Smet, Dirk Poelman
Journal of Luminescence 129 (2009) 1140-1143

Abstract
The luminescence properties of Ca2Si5N8:Eu,M (with M = Nd, Sm, Dy, Ho or Tm) are reported.Ca2Si5N8:Eu without codopants shows a relatively weak afterglow. Ca2Si5N8:Eu,Tm shows the highest persistent emission intensity, with an orange emission colour due to a broad emission band peaking at 620 nm. The persistence emission spectrum is red-shifted by about 10 nm compared to the steady state photoluminescence. Based on thermoluminescence measurements, it is shown that the addition of Nd, Dy and Ho to Ca2Si5N8:Eu introduces trap states which are too shallow for considerable enhancement of the persistent luminescence. The persistent luminescence in Ca2Si5N8:Eu,Tm is e ciently excited in the visible part of the spectrum.

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