| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5402959 | Journal of Luminescence | 2009 | 4 Pages |
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 color due to a broad emission band peaking at 620Â nm. The persistence emission spectrum is red-shifted by about 10Â 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 efficiently excited in the visible part of the spectrum.
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Authors
Koen Van den Eeckhout, Philippe F. Smet, Dirk Poelman,