Enhanced long persistence of LiSr4(BO3)3:Eu2+ orange phosphors by co-doping with Dy3+

• A novel orange emitting LLP material based on LiSr4(BO3)3 was prepared successfully.
• The band structure of LiSr4(BO3)3 were studied by calculation and experiment.
• The introduction of Dy3+ had a great contribution to the afterglow performance.

A novel orange emitting long-lasting phosphor based on LiSr4(BO3)3 host matrix was prepared by a solid-state reaction under a reductive atmosphere. Both diffuse reflectance spectra and photoluminescence emission spectra of the Eu2+-doped and Eu2+, Dy3+ co-doped samples revealed only the 5d–4f transitions of Eu2+. The broad emission band of Eu2+ appeared to be asymmetric, which illustrated only Eu2+ acted as the emission center in two different Sr sites. The duration of co-doped samples was prolonged drastically, compared with that of the Eu2+ single-doped samples. Investigation of thermoluminescence curves revealed that the incorporation of Dy3+ created more appropriate energy traps leading to the enhancement of afterglow.

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