V. Liepina, D. Millers * , K. Smits, A. Zolotarjovs, I. Bite

SrAl₂O₄:Eu,Dy is a very efficient long afterglow phosphor with wide range of possible applications. In this study we carried out the study of X-ray excited luminescence of SrAl₂O₄:Dy and SrAl₂O₄:Eu,Dy samples, including the measurements of afterglow at low temperatures within extended time scale. We observed both Eu and Dy luminescence peaks in the afterglow and TSL measurements. In recent articles the tunneling of electron from trap levels to excited Eu luminescence center was discussed, and in this research we conclude that under X-ray irradiation Eu²⁺ and Dy³⁺ serve as hole traps; electron tunneling is present in both SrAl₂O₄:Eu, Dy and SrAl₂O₄: Dy, and luminescence afterglow at 10 K arises from decay of excited Eu²⁺ and Dy³⁺ centers created via electron tunneling from host trap to Eu³⁺ and Dy⁴⁺ ions.

Journal of Physics and Chemistry of Solids

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