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Journal of Physics D Applied Physics

Article . 1993 . Peer-reviewed

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Journal of Physics D Applied Physics

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Trapping of electrons by H+in the X-ray storage phosphor Ba3(PO4)2:Eu2+, La3+

descriptionPublicationkeyboard_double_arrow_right Article 14 Sep 1993Publisher:IOP PublishingJournal:Journal of Physics D: Applied Physics, volume 26, pages 1,487-1,492 (issn: 0022-3727, eissn: 1361-6463,

Authors: J. J. Hamelink; E M Langeveld; G. Blasse; W. J. Schipper;

doi: 10.1088/0022-3727/26/9/023

Trapping of electrons by H+in the X-ray storage phosphor Ba3(PO4)2:Eu2+, La3+

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Abstract

When co-doped with La3+, Ba3(PO4)2:Eu2+ shows an intense thermally stimulated luminescence after X-ray irradiation. The phosphor is also optically stimulable. The stimulated emission is due to the Eu2+ ion. In the absence of Eu2+ a broad emission band is observed which is tentatively ascribed to a phosphate group close to the La3+ ion. EPR reveals the presence of H0 after irradiation. It is concluded that the substitution of La3+ on a Ba2+ site is accompanied by the introduction of H+ into the lattice. The latter ion acts as an electron trap; detrapping yields the stimulated luminescence.

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