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Materials 2013, 6(7), 2789-2818; doi:10.3390/ma6072789

Persistent Luminescence in Non-Eu2+-Doped Compounds: A Review

1 LumiLab, Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, 9000 Gent, Belgium 2 Center for Nano- and Biophotonics (NB-Photonics), Ghent University, 9000 Ghent, Belgium
* Author to whom correspondence should be addressed.
Received: 20 May 2013 / Revised: 18 June 2013 / Accepted: 3 July 2013 / Published: 12 July 2013
(This article belongs to the Special Issue Luminescent Materials 2013)
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During the past few decades, the research on persistent luminescent materials has focused mainly on Eu2+-doped compounds. However, the yearly number of publications on non-Eu2+-based materials has also increased steadily. By now, the number of known persistent phosphors has increased to over 200, of which over 80% are not based on Eu2+, but rather, on intrinsic host defects, transition metals (manganese, chromium, copper, etc.) or trivalent rare earths (cerium, terbium, dysprosium, etc.). In this review, we present an overview of these non-Eu2+-based persistent luminescent materials and their afterglow properties. We also take a closer look at some remaining challenges, such as the excitability with visible light and the possibility of energy transfer between multiple luminescent centers. Finally, we summarize the necessary elements for a complete description of a persistent luminescent material, in order to allow a more objective comparison of these phosphors.
Keywords: persistent luminescence; long-lasting phosphorescence; rare earths persistent luminescence; long-lasting phosphorescence; rare earths
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Van den Eeckhout, K.; Poelman, D.; Smet, P.F. Persistent Luminescence in Non-Eu2+-Doped Compounds: A Review. Materials 2013, 6, 2789-2818.

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