Synthesis and optical properties of P⁵⁺ co-doped Ba₃SiO₅:Eu²⁺ orange persistent phosphor

By co-doping the P⁵⁺ ions into Ba₃SiO₅:Eu²⁺, we synthesized new orange persistent phosphor using cellulose assisted liquid phase precursor (LPP) method. The emission spectra showed a typically broad orange emission band centered at 575 nm attributed to the 4f⁶5d¹ → 4f⁷ transition of Eu²⁺ ions under 400 nm excitation source. The persistent luminescence property of Eu²⁺ doped Ba₃SiO₅ orange phosphor was enhanced by co-doping non-equivalent phosphorus ions into silicon sites. This enhancement can be explained by formation of the trapping center due to the charge compenstation. Consequently, the afterglow decay exhibited an orange emission for more than 5 min after irradiation at under 365 nm for 1 min.