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Luminescence and energy transfer in the columbite structure

descriptionPublicationkeyboard_double_arrow_right Article 01 Sep 1985 English Publisher:Elsevier BVJournal:Materials Research Bulletin, volume 20, pages 1,037-1,045 (issn: 0025-5408,

Authors: M.G.J. van Leur; G. Blasse;

doi: 10.1016/0025-5408(85)90202-8

Luminescence and energy transfer in the columbite structure

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Abstract

The luminescence properties of undoped and Eu/sup 3 +/- and Dy/sup 3 +/doped CdNb/sub 2/O/sub 6/ and CaNb/sub 2/O/sub 6/ are reported and discussed in connection with the luminescence of niobates and tungstates with wolframite and columbite structure. It is shown that these structures lead in principle to highly efficient luminescent materials. However, disorder between the metal ions reduces the efficiency considerably. In CdNb/sub 2/O/sub 6/ the niobate excitation energy is more mobile than in CaNb/sub 2/O/sub 6/. This has important consequences for the rare-earth activated materials. At 300 K the amount of rare-earth emission from the CdNb/sub 2/O/sub 6/-based samples is high. This is due to energy migration in the host lattice and efficient transfer to the activator (R /SUB c/ approx. = 7A).

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Utrecht University
Netherlands

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