A recently developed method to determine the energy levels of divalent lanthanide ions relative to the conduction band and valence band of host compounds is applied to Sr 2 MgSi 2 O 7 doped with Eu 2+ and Dy 3+ . The level locations are not consistent with the widely adopted and generally believed mechanism of persistent luminescence in Eu 2+ and Dy 3+ doped aluminates and silicates. A new mechanism of persistent luminescence is proposed. In this mechanism Eu 3+ and Dy 2+ are the stable trapping centers and not Eu + and Dy 4+ as in the existing mechanism. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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P. Dorenbos (2004) studied this question.
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