Long Persistence in Sr/BaAl₂O₄: Eu²⁺: Dy³⁺ Green Phosphor

Abstract

Solid solution of barium strontium aluminate, Sr/BaAl₂O₄: Eu²⁺ co-doped with Dy³⁺ was prepared by solid state reaction method. The prepared phosphor compositions with varying Dy³⁺ compositions were investigated by powder X-ray diffractometer (XRD), SEM, TEM and photoluminescence (PL) excitation and emission spectra. Long persistent luminescence was observed in these phosphor materials. The broad band UV excited luminescence of the Sr/BaAl₂O₄:Eu²⁺:Dy³⁺ was observed in the green region (λ_max = 500 nm) due to transitions from the 4f⁶5d¹ to 4f⁷ configuration of the Eu²⁺ ion. Effects of co-doping of Dy³⁺ on the photoluminescence properties of these compositions were investigated.