The luminescence properties of Eu2+in the novel host lattice Ba(SCN)2has been investigated. At low temperature a strong green emission is observed with a maximum at 511nm, which is strongly quenched with increasing temperatures. The excitation spectrum yielded a Stokes shift which clearly shows the presence of a 5d → 4f emission. The quenching behaviour can be explained by the fact that the lowest 5d state is located at slightly lower energy than the conduction band of the host lattice. At increasing temperature thermal occupation of the conduction band occurs followed by nonradiatively excitonic relaxation to the ground state. The luminescence properties of Ba(SCN)2:Eu2+are very similar to those of Sr(SCN)2:Eu2+. © 2003 Elsevier B.V. All rights reserved.
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